GREEN BUGS DAMAGING CITRUS TREES
21/06/2023
GREEN BUGS DAMAGING CITRUS TREES 17/06/2022 Green bugs specialize in the fruit of citrus groups (oranges, tangerines, lemons, grapefruits, kumquats...), some people call them orange bugs, or orange suckers. Their scientific name is Rhynchocoris poseidon or Rhynchocoris humeralis. a. Morphological characteristics: The adults are glossy green, with a body length of 20-22 mm and a width of 15-16 mm. The needle is long to the end of the abdomen. The anterior margin of the thorax has 2 sharp spines, the sides of the abdomen have a serrated edge. There is a prominent line in the middle of the abdomen. Larvae have 5-age level, newly hatched larvae are about 2.5-3 mm long. At other ages, larvae are bright yellow, on the thorax, wings and abdomen there are many black spots, the spots are very large and dark in young age, when the larvae molt, the spots become smaller. The wing buds of the 5-year-age larvae were clearly visible outside the body. Eggs are very round, newly laid is white, then turn pale yellow, when about to hatch, the eggs are black on the head.part b. Biological characteristics: Adults are usually active in the early morning or late afternoon, and are common in dense gardens. When it is scorching hot, bugs often hide in the foliage. The adults usually lay eggs in groups of 10-15 eggs, arranged in 2-3 rows. Eggs are laid on the fruit or on the leaves near the fruits. After hatching, the 1-year-age larvae usually live around the eggs for a while, then disperse to other fruits to suck the juice. a. Symptoms and effects: Bugs attack the fruit when the fruit is very young. Both adult and larvae use proboscis to suck fruit. When small fruit is damaged, the fruit will yellow, callus and then fall. If large fruit is attacked, the fruit may rot due to superinfection with Fungi or some other Microorganism. The place of the sting has a small dot with a brown halo. The most important damage is on the small fruit stage. One Bug in a day can sting on many fruits. b. Preventive measures: Breeding yellow ants Oecophylla smaragdina in orange, tangerine, grapefruit, and lemon orchards.Use a racket to catch bugs in the early morning or late afternoon, remove the eggs. Because bugs only cause damage mainly in luxuriant and dense gardens, pruning measures, clearing the garden for ventilation are essential to limit the damage of bugs. Garden bugs are easy to detect because the bugs secrete a very specific smell. Every week, at the fruit setting stage until a month later, if the number of bugs reaches the threshold of 1 insect/tree, use chemical products Fenbis 25EC, Lancer 50SP, Sairifos 585EC, Secsaigon 25EC, Sapen alpha 5EC... to prevent treat. Note: the use of products is highly effective when detecting young bugs and killing them. |
To prevent, in addition to plowing and burying weed seeds, collecting weed stalks and stumps left after tilling the land to burn, not letting weeds produce seeds in production fields, etc., the use of chemical products is still a measure. optimal because of its ability to thoroughly kill weeds, reduce labor and take advantage of more time than manual weeding.
Miner has the scientific name Phyllocnistis citrella Staint., family Phyllocnistidae, order Lepidoptera. The miner occurs in many countries in the tropics and subtropics. The main host of the miner is the citrus family - Rutaceae. In addition, the miner also attacks mangosteen and some other plants.
Adult is a small planthopper, with a body 2-3 mm long, the whole body is ash gray, slightly greenish, the wings are opaque with many small brown spots.Eggs are oval, 0.3 mm long, have a pointed end and are attached directly to the leaf surface, leaf axils.
In Vietnam, yellow leaf curl disease is very common on papaya trees, especially the disease is often severe in areas of high and continuous planting, areas with hot and arid climates. The disease has significantly reduced the yield and quality of papaya. Gardens that are infected early when the plants are young may not yield. However, up to now, many gardeners still do not know the cause and how to fix it.
Spider mites are common pests on citrus trees, especially in hot and dry climates that are suitable for spiders to grow and cause severe damage.The group of harmful spiders is usually very small in size, unlike the natural enemy spiders.
This group includes species that are generally very small in size, causing damage by sucking plant sap (on leaves, fruits, branches, stems).
There are many species of mealybugs present on the group of Oranges,Tangerines,Grapefruits and Lemons (Citrus), which can be divided into 2 groups:
+ Group of sticky mealybugs with common varieties such as Lepidosaphes, Aonidiella, Coccus and Saissetia.
+ Group of flower mealybugs with common genera and species such as Pseudococcus, Planococcus and Icerya purchasi.
Dry branches and berries disease often appear to be common damage on coffee gardens during the rainy season. The disease causes death of branchs, dry fruit, severely affects the canopy structure and coffee yield if not paid attention to prevention.
Pink disease commonly causes diseases on rubber plantations in the rainy season, especially on garden from 4-8 years old. This year, rubber has to go through a period of severe drought, weakening the tree, so now in tnshe rainy season it is easy to get infected. Therefore, it is necessary to pay attention to good management to avoid affecting the garden.
In recent years, the area of citrus has been expanded because it is a fruit tree with high economic efficiency. However, in order to sell at a high price, not only in quality but consumers also require the external beauty of the fruit, so pest management on citrus is a matter of great concern to farmers. The hot season is a favorable condition for thrips to develop and cause damage, affecting the commercial value of fruit.
Currently in Vietnam, the cultivation of citrus trees is playing an important role in the country agricultural production. The benefits of citrus trees have made many farmers rich. However, wherever citrus trees are planted, fissured trunk cracking appears and causes damage. If any gardener is negligent or lacks attention to this disease, the tree will die, even the whole garden.
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