- Tangerine Tree Diseases
- Alternaria Brown Spot
- Greasy Spot
- Citrus Scab
- Phytophthora Root Rot
- Leaf Curl In Orange Trees: Why Are My Orange Tree Leaves Curling
- Why are My Orange Tree Leaves Curling?
- Citrus Tree Leaf Curl Treatment and Pests
- Diseases Causing Orange Tree Leaf Curl
- Other Reasons Why Orange Leaves are Curling
- What’s Wrong with my Citrus Tree?
- We look at the most common citrus pests and diseases that can afflict your trees, along with symptoms and control options:
- Citrus Symptoms:
- Most likely cause: Aphids
- Most likely cause: Scale
- Most likely cause: Mealybugs
- Most likely cause: Citrus Scab (Verrucosis)
- Citrus Symptoms
- Most likely cause: Leaf Curl
- Most likely cause: Leaf Drop
- Most likely cause: Fruit drop
- The orange tree, a short story
- Health benefits of oranges
- How to use it best
- Growing orange trees to benefit from their medicinal properties
- Orange species and varieties
- Using oranges in cooking for their health benefits
- Orange leaves herbs
- Health benefits of orange-lemon leaves
Tangerine Tree Diseases
Tangerine image by sister from Fotolia.com
Tangerine trees can contract several diseases, which display symptoms on the leaves or the fruit and are easily distinguished from one another. Most tangerine diseases can be controlled once identified. Trees that are given regular water and fertilizer and are planted in a location receiving good air circulation are less prone to disease than those in less optimal conditions.
Alternaria Brown Spot
Alternaria brown spot affects Dancy and Murcott tangerines, among other varieties of tangerine and citrus. The disease causes brown spots and yellow discoloring of tangerine leaves; leaves can eventually fall off the tree. Branches and twigs may die back at the tips, and fruit can develop brown blemishes on its skin. The University of Florida suggests planting disease-resistant types of tangerine and controlling the fungus with a copper-based fungicide.
Greasy spot affects both tangerine trees and tangerine hybrids, though it hits grapefruit and orange trees worse. Symptoms of this include yellow and brown spotting on the leaves and blistering on the leaves that makes them appear greasy, hence the disease name. Copper fungicides and preventative spraying can control greasy spot.
Tangerine hybrid trees can contract citrus scab, which gives fruit pinkish-tan lesions on its surface. The lesions turn dark brown, then gray before cracking. Tangelos and Murcott tangerines can experience both citrus scab and Alternaria brown spot at the same time, warns the University of Florida. Growers can control this disease with copper fungicide.
Phytophthora Root Rot
Phytophthora causes root rot in tangerine trees. Symptoms include rotting of the trees roots (difficult to detect since this happens underground), peeling of the bark along the trunk and the tree crown, die back of branches and eventual death. Phytophthora root rot occurs when trees are planted in poor draining soil so that the roots stand in water. There is no known cure; growers should plant trees in well-draining soil.
My beloved Citrus, which yields me so much bounty, has thrips, mealy bug and even a touch of scale. It’s not a pretty sight close up. Regardless, it bears luscious fruit which I use for smoothies, poaching, salad dressing, flavoring water and more – if I had a bathtub, I’d bathe in it! If you refer back to this post “A Story of Thrips and Bad Pruning” you’ll see part of the cause of this horticultural nightmare – the neighbor’s closely planted Myoporoum hedge is riddled with thrips and aphids.
Above is the tree before its initial “whammy” of a prune job. You may not be able to tell but it is in a corner of the back yard with the motley hedge on one side and the neighbor’s garage on another – both of which reduce the air circulation in and around the tree. Lack of air circulation = increased insect breeding.
Here are close-ups looking inside the tree illustrating how densely it grows. It’s so white from the mealy bug you can’t see the thrips!
Here you can see the discoloration on the skin of the fruit cause by the thrips. I do not use chemical sprays or fertilizers anywhere in my garden. The fact that the skin’s appearance is not wonderfully smooth and orange is of no concern to me because I am not commercially selling the fruit. So, to help the tree combat the onslaught of pests, we thinned it and opened it up to increase the air circulation and let more sunlight into the center.
A mere drop in the bucket of what was actually taken off the tree.
Some of the fruit which was shared with friends.
Yum – not pretty on the outside but vibrant and juicy on the inside!
The video below gives you a closer look at the Joy Us Orange Tree and its environs.
Leaf Curl In Orange Trees: Why Are My Orange Tree Leaves Curling
Citrus growers know going in that oranges are a fickle bunch and orange trees have their fair share of problems. The trick is to recognize the signs as soon as possible so the situation can be remedied. One of the most obvious signs of an orange in distress is orange leaf curl. Once you have spotted leaf curl in your orange trees, the obvious question is why are my orange tree leaves curling and is there a cure?
Why are My Orange Tree Leaves Curling?
Citrus trees may be affected adversely by pests, diseases, environmental conditions and/or cultural practices. There are four major reasons for leaf curl in orange trees: pests, disease, water stress and weather. Sometimes it’s a combination of all four.
Citrus Tree Leaf Curl Treatment and Pests
If you observe orange leaves that are curling, one culprit may be an insect pest, or rather many insect pests because they never seem to travel alone, do they? All of these marauders have a taste for the sap running through the foliage of your citrus orange tree:
- Spider mites
- Citrus leaf miners
- Citrus psyllid
Check your citrus for signs of these pests. If this appears to be the answer to your orange leaf curl, it’s time to do some damage. In this instance, citrus leaf curl treatment can lean in two directions. First of all, there are a number of predatory insects that can be introduced such as ladybugs, predatory wasps and green lacewings. These guys will bring the pests numbers down in no time.
If you choose, you can also use an insecticide to treat the pest problem. Apply horticultural oil, insecticidal soap or neem oil to your orange tree on a cool, calm day.
Diseases Causing Orange Tree Leaf Curl
If your orange leaves are curling, the culprit might just be a fungal disease. Both bacterial blast and botrytis disease result in leaf curling.
Bacterial blast begins with black spots on the petiole and moves on to the axil. Eventually, the leaves curl, wither and drop. To combat this disease, apply copper spray to the infected orange.
Botrytis disease infiltrates trees that have open wounds. A gray, velvety mold grows on the damaged area followed by leaf discoloration, curling and twig dieback. Prevent this disease by preventing injury to the tree from machinery, frost and rot. Apply a copper fungicide as a citrus leaf curl treatment before wet weather to prevent the fungus from reaching the blossom or fruit stage.
Other Reasons Why Orange Leaves are Curling
Water stress is probably the most obvious reason for leaf curl on a citrus. Lack of water will eventually affect the flowers and fruit which will drop prematurely. The amount of water an orange tree needs depends on the type, time of year, weather and the size of the tree. As an example, an orange tree with a 14-foot canopy needs 29 gallons of water a day in July when it is dry! Overwatering can affect the orange tree as well. Be sure to plant the tree in an area of excellent drainage. Remember, citrus trees don’t like overly wet feet.
Weather may also affect the foliage of the orange. Of course, extreme hot spells will dry the plant out so you should water more frequently, especially if your tree is potted. Citrus is also susceptible to sunburn, which will also cause leaves to curl as well as peppering fruit with yellow or brown blotches. Cold weather may also cause leaves to curl. Cover citrus trees if a cold snap is expected.
Finally, sometimes orange foliage will cup downward in the late fall or early winter. This is normal and nothing to worry about since new growth will emerge with ordinary shaped leaves in the spring.
What’s Wrong with my Citrus Tree?
It wouldn’t be a Kiwi garden without a citrus tree! Although they quite easily thrive in the garden, sometimes they can run in to a few problems. If you want to grow spectacular citrus, our top tip is to keep your tree well fed and healthy as they are less likely to be plagued by pests and diseases.
- Distorted buds and leaves
- Sticky “honeydew”
- Black sooty mould growing on the honeydew
- Clusters of black, yellow, green or brown insects on leaves
- Ants crawling on the plants and feeding on the honeydew
Most likely cause: Aphids
Aphids are unmistakable in the garden. Easy to spot, aphids are tiny, pear-shaped, sucking insects that love to feed on new growth. There are several species and they may be yellow, green, brown or blackish. They can be referred to as greenfly or blackfly, but they are not actually flies.
Although a single aphid is not a big threat, aphid colonies can grow shockingly quickly and you will easily be able to see them in clusters on shoots, buds and leaves. As they feed, the plant will become brittle and yellow and the plants will slip into decline.
Since aphids are such tiny, tender insects, you can often control them by hosing them off with a strong blast of water. You will need to get all areas of the plant, including the undersides of the leaves, and you will need to do this more than once.
If water does not seem to be controlling them, you can try insecticidal soap. Make sure the plant is completely coated. The soap needs to make contact with the aphid.
Another natural/organic option is Yates Nature’s Way Citrus, Vegie and Ornamental Spray, which controls aphids on contact. Yates Conqueror Oil concentrate is another option.
- Poor growth
- Leaf drop
- Pale, dehydrated leaves
- Small and dry fruit
- Hard, scale-like insects on woody and green stems
Most likely cause: Scale
Scale are sap sucking insects that can be white, brown, black or even pink in colour. They look like patches or raised bumps that appear on stems or the underside of leaves. Scale quickly multiples in dry seasons.
Citrus scale pests can spread rapidly so act as soon as you notice a problem. A natural/organic option is Yates Nature’s Way Citrus, Vegie and Ornamental Spray, which controls scale on contact. Yates Conqueror Oil concentrate is another option.
- Black, sooty mould
- Small insects found in protected cavities
Most likely cause: Mealybugs
Mealy bugs are small sap sucking insects that have a furry white coating. A natural/organic option is Yates Nature’s Way Citrus, Vegie and Ornamental Spray, which controls scale on contact. Yates Conqueror Oil concentrate is another option.
A natural/organic option is Yates Nature’s Way Citrus, Vegie and Ornamental Spray, which controls scale on contact. Yates Nature’s Way Pyrethrum concentrate is another option.
- Rough skin on fruit, stems and leaves
- Wart like lesions on the outside of fruit
- Fruit drop often occurs.
Most likely cause: Citrus Scab (Verrucosis)
This fungal disease is usually encouraged by damp, cool weather. Although the fruit is unaffected on the inside, this disease needs to be controlled as it will gradually reduce the vigour of the tree.
A natural/organic option is Yates Nature’s Way Fungus Spray, a sulphur and copper fungicide to control citrus scab. Yates Copper Oxychloride concentrate is another option.
- Severely deformed leaves
- Leaves changed colour
- Curled leaves
Most likely cause: Leaf Curl
Citrus leaves can curl when temperatures are cold or extremely hot, some insect infestations such as scale, mealy bug, mites or aphids will cause leaves to curl. Over-watering can also cause this. Other times it is leaf curl disease. Leaf curl overwinters in buds of infected trees. Collect up any infected leaves that fall and burn or dispose of, do not compost as this will spread the disease.
A natural/organic option is Yates Nature’s Way Fungus Spray, a sulphur and copper fungicide to control leaf curl. Yates Copper Oxychloride concentrate is another option.
- Loss of leaves
Most likely cause: Leaf Drop
Citrus trees naturally shed their leaves from time to time, usually having a life span of 3-4 years. If a lot drop off at once, or over a short period of time, this usually indicates that something isn’t right.
Leaves will drop after a sharp decrease in temperature, so if you’re citrus tree is in a pot, move under cover or to a warmer area of your property. If plants are receiving too much, or not enough water, known as water stress, this can also lead to leaf drop. Root bound plants can also drop their leaves, so if your citrus tree is in a pot or container and you’re watering correctly, this may be the cause.
- Small sized fruits dropping from the tree
Most likely cause: Fruit drop
Fruit drop can be a common occurrence among citrus trees. A part of that is normal – it happens when a tree sets more fruit than it can support (often in young trees). First, blossoms drop without setting fruit, then pea-size fruit falls from the tree, then fruit the size of golf balls may fall off. This can all be normal. Continuous fruit drop, however, is not. This can be brought on by many factors, though typically it’s a result of environmental stress (cold wind, sudden changes in temperature, inadequate nutrition, lack of moisture) or poor pollination.
Adequate moisture during the early stages of fruit development is crucial. If rain is scarce, regular watering is necessary. Apply a layer of mulch to conserve moisture in the soil, though keep the mulch away from the trunk or it may rot. Clear away any weeds too as these compete for water and nutrients. In cooler areas, keep your plants sheltered from cold winds. If moving them to a protected spot over winter, do so gradually to give the plant time to adjust.
The orange tree, Citrus Aurantium (bitter) or sinensis (sweet) is a tree with a round shape that belongs to the Rutaceae (Rue) family.
The orange tree never grows taller than 32 feet (10 meters) tall, and collectively forms the citrus plant that is most grown the world over.
Just to give you an idea, although the French don’t grow oranges much, they eat over 17 kg of these fruits per person per year!
- Gardening: how to grow orange trees
- Health: all our pages connecting plants and health
The orange tree, a short story
Sweet orange is most probably the result of a mutation of the bitter orange tree, about 2,000 years ago. In China and India, bitter oranges were already grown and cultivated 3,000 years ago. The lower Himalayas, near Bangladesh, is most certainly the native area of this citrus.
Greeks and Romans… Nobody was familiar with sweet oranges. The Arabs were the first to introduce the fruit to Egypt and Palestine, which is where the crusaders discovered it. The Portugese successfully spread the orange tree, when they brought it back from China or Ceylan (Sri Lanka) around the 15th century.
Health benefits of oranges
Health benefits of bitter orange
- Bitter orange leaves are used for their sedative properties: they alleviate spasms in nervous persons and help them fall asleep. Bitter orange leaf is also recommended against hacking cough, nervous stomach cramps, heart palpitations and cephalalgia (headache). It is also sometimes used as a febrifuge and a diaphoretic (to increase sweating) in case of colds. Bitter orange essential oil is also called “Petitgrain essential oil”.
- Orange tree flowers can also be used in similar fashion, but it is more often used to produce “orange blossom water” which is very fragrant and is part of pharmaceutical and culinary preparations. It also boasts relaxing properties, too.
- Essential oil that underlies the hydrolate during the distillation process is called “neroli oil”, and is an ingredient in top-quality Cologne. It is famously rare, and has properties that are tonic and stress-relieving.
- Orange has carminative and digestive properties (meaning it helps expel gas build-ups in the digestive tract). Orange infusions lowers fever and soothes headaches. Orange zest is used to make syrup, tincture or alcoholates. Oranges are great appetite enhancers, excellent stomach tonics that increase digestion. When pressing the fruit, “bitter orange essence” is extracted.
- The sweet orange tree is part of the most cultivated fruits in the world. If today, almost anyone can savor a delicious orange juice for breakfast, this was definitely a luxury in the XIXth century.
- With sweet orange, such delicacies as refreshing and tangy syrups can be made, and a type of lemonade, too: orangeade! Syrups and orangeade are both recommended for their health benefits in case of fever.
- Sweet orange zests are the source of sweet orange essential oil, also called Portugal essential oil, which is used in perfume.
- Leaves and flowers of sweet orange trees: they have the same properties as those of bitter orange.
- Zests are indicated in case of problems linked to fragile blood vessels, such as bruises.
- Bed-ridden persons, or persons who have just been operated and are recovering, often feel pain in their heels. In this case, simply slice an orange in half, carve out the flesh, and cap your heels with the half-rinds.
How to use it best
- Orange infusion: ⅔ oz (20 g) of flowers or leaves for 1 quart (1 liter) of water. Steep for 10 minutes. Drink 2 to 3 cups a day, with one of those just before sleeping to induce sleep. To increase the fragrance and the effectiveness, feel free to add a couple drops of orange blossom water.
- Decoction of orange tree leaves: 120 to 150 leaves for 1 quart (1 liter). It was used in olden days to treat epilepsy and in case of severe nervous disorders.
- Bitter orange tree bark syrup: this syrup is tonic and stomachic. Preparation: 3.5 oz (100 g) dry zests chopped and macerated for 12 hours in 3.5 oz (100 g) alcohol (60% volume). Filter and add syrup prepared with 12 oz (350 g) to 1 quart (1 liter) water. Eases digestion.
- Tonic and appetite-inducing orange wine: macerate 3.5 oz (100 g) dry bitter orange zests in 1 quart (1 liter) white wine with a couple chamomile flowers.
- Orange tree leaf and flower infusion: smooths and nourishes skin.
Growing orange trees to benefit from their medicinal properties
To grow an orange tree, neutral pH soil is ideal. Choose a clay soil, that retains water and fertilizer but not excess moisture. As for exposure… Sun!
The trunk can cope with 16°F (-9°C), but leaves die off under 26°F (-3°C). Between 32 and 50°F (0 to 10°C), orange trees stay in a dormant state. To bloom and bear fruit, it must grow in areas where the average yearly temperature is at least 57°F (13°C).
Take note, though, that orange tree also doesn’t really like strong heat. Over 95°F (35°C), it again enters dormancy. Last tip: avoid wind-scoured places because branches break easily, especially when they are loaded with fruits.
Smart tip about orange trees
Whether you choose to grow it in pots or directly in the ground, don’t scratch the soil surface any deeper than 2 inches (5 cm) when weeding, because you might damage superficial roots. They are fragile and any wound is an open door to disease.
What about potted orange trees? Yes, it can be done. But you must know that only a lean-in or a cool greenhouse will help it overwinter without any problems. In garden boxes, these are very ornamental plants.
Watch out for small bugs!
When orange trees fall sick, most often this can be traced to poor growing conditions.
- Scale insects often invade citrus trees (they can be eliminated by treating with white oil, which will suffocate them). Mites and ticks distort leaves and young stems, making them look heavy.
- Citrus blossom moth larvae attack stamens and hinder fruit formation.
- Chlorosis symptoms are a yellowing of leaves.
- Several different viral infections also can lead orange trees to wilt away. If growing in a sheltered place, watch out for whiteflies.
- Gardening: how to grow orange trees
Orange species and varieties
There are three major types of oranges: Valencia oranges, navels and blood oranges.
The Valencia oranges are divided into common cultivars and fine cultivars.
Common cultivars grow easily along coastal waters and produce small, tasteless fruits.
Fine cultivars are of much better quality, and mature between November and March. Among these are:
- ‘Valencia Late’ – late, juicy, sweet.
- ‘Maltese’ – one one of the best, matures rather well in mild-wintered climates.
- ‘Jaffa’ – large fruits, fragrant flesh.
- ‘Salustiana’ – large fruits, rather hardy.
Navels – these are mature in November. Their distinct feature is that a second orange embryo forms inside another orange. They are sweet and are easy to quarter.
- ‘Washington Navel’, ‘Navelina’ and ‘Navelate’ are the most common ones.
Blood oranges – these mature in February.
- ‘Moro’, ‘Sanguinelli’ are the favorite varieties that connoisseurs mention. However, they produce for only a short time and require a lot of heat to mature.
Semi-sanguine oranges also exist.
- ‘Semi-blood Maltese’, ‘Enhanced double fine’: these produce fruits for harvest in March and April.
Using oranges in cooking for their health benefits
You can of course savor oranges fresh, either raw or pressed, in jams, marmalade or ice cream. Orange can be added to sauces or be candied. Infusions prepared from 0.7 oz (20 g) of leaves opens one’s appetite. As for orange blossom, it is a sedative often found in herbal tea.
Nutritional content of orange
45 kcal / 3.5 oz (100 g). An orange covers most daily needs for an adult in vitamin C (80 to 110mg/day). Orange also has high trace element and organic acids levels, which combine with alkaline substances in our body to produce carbonates and bicarbonates which have acknowledged benefits in case of heartburn and arthritis.
Savory idea with oranges
Now is to open up to tasting orange carpaccio. This quick and easy recipe is impossible to mess up! In your shopping list: oranges, a few mint leaves, a little cinnamon and the result is delicious!
A few synonyms of “orange” to shine in public…
The word “orange” actually comes from Sanskrit. The same root became naranja in Spanish, laranja in Portugese, naranza in Venice and naranj in the Arab world. Bitter orange is also called the “Seville orange”.
Credits for images shared to Nature & Garden (all edits by Gaspard Lorthiois):
Orange & juice by Pixel2013 under license
Orange leaves herbs
ORANGE LEAVES HERBS
Orange leaves herbs are useful for the health being of the body. They may be used to make a leaf tea or added to the pot when brewing regular tea. Citrus leaves are especially good for this kind of tea. Only the older, dark-green leaves should be used. Tear them into boiling water. They contain minerals that the body needs. If added to warm milk, crushed citrus leaves can make a nutritious drink for children.
Citrus leaf tea is good to drink in the evening because it contains no caffeine, which is found in tea and coffee. Caffeine can keep you from sleeping well.
How to make orange leaves herbs tea :
- Crush 10 ORANGE LEAVES HERBS into 6 cups of boiling water. Boil for 5 minutes. Cool for a few minutes.
- Remove leaves and add milk, if desired, to the warm citrus tea and serve.
Min.Order Quantity : 1 Kilogram
Supply Ability: 2000 Kilogram/Kilograms per Week
Port: Casablanca /Tanger MED / Agadir
Payment Terms: L/C,T/T,Western Union,MoneyGram,PAYPAL
Packaging & Delivery
Packaging Details : bulk, carton, sachets, jar, bottle, etc
Delivery Time: 15 days after confirmation of all detaills and deposit
Place of Origin: Morocco
Processing type: Leaves Herbs
Form : Herb
Use: Body, Face and hair
Supply Type: OBM (Original Brand Manufacturing)
Brand Name: BioProGreen or private labeling
Cultivation type: Organic
Main Ingredient: ORANGE LEAVES
FOB Price :Contact US
Product available in private labeling contact us for more informations : BioProGreen
Health benefits of orange-lemon leaves
It might sound incredible but believe it or not, orange-lemon leaves are associated with undoubtedly amazing health benefits. These particular leaves are highly enriched with secondary metabolites that are of great importance in the body.
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According to healthyt1ps.com, orange-lemon leaves have been found to cure a number of ailments by simply drinking their extract.
Fight cancer. Cancer is a dangerous disease has claimed the lives of many. According healthyt1ps.com, it is reported that, the leaves alleviates cancer(breast, lung and colon) by simply suppressing the abnormal cells growth. This is due to the fact that they contain limonene, secondary metabolite that have anti-bacterial properties. Keeps the heart fit as fiddle. The heart is liable to health risks basically caused by daily health habits like stress, excessive alcohol consumption, smoking and among others. According to healthyt1ps.com, the leaves extract are used to keep the heart fit as fiddle.Due to their secondary metabolites, limonene, tannins, phenols, studies have shown that they lower cholesterol level in the blood hence barring heart-related problems. This, in turn, keeps the cardiovascular system in good shape.
They are anti-aging products. According to diyhealthremedy.com , they delay aging process by providing a smooth skin and ousting wrinkles on the skin. This is due to the fact that they are packed with numerous flavonoids. Make a herbal tea of the leaves and consume daily for a better skin.