THRIPS 21/06/2023

THRIPS

Thrips are common pests on many crops such as rice, vegetables, beans, cashew, CAT,... This is a very small insect, but can be seen with the naked eye, elongated body, mouth very hard, strong, damaging by using mouth to puncture the young parts of the tree such as young leaves, buds, flowers, fruits, ... Then suck the sap.

 

On the leaves, thrips sting on the underside of the leaves, causing the leaves to develop abnormally, curled, and both edges curved down. On the bud, the bud does not produce leaves. On the flower, the flowers wilt, dry, and then fall off. If it occurs on fruit, it will make the fruit skin near the stem dark gray (bran skin), deformed fruit, if thrips appear with high density and cause late damage, the fruit skin (both young and large fruits) will be lumpy. the value of the commercial product is reduced and cannot be exported..

Hot, dry weather is favorable conditions for thrips to develop. Therefore, in the South, thrips often appear and cause damage in the hot months (from December to May), it should be noted that thrips have a relatively short life cycle: About 13-20 days, laying eggs many (25-30 eggs), so if not detected early and properly prevented, the damage will be more severe, so at these times we need to regularly visit the garden, investigate, if the tree If there are symptoms as described above and if the thrips population is high (over 3-5 individuals/bud, leaf or fruit), then proceed to control immediately. To know if the population of thrips is high or low

we can shake flowers with our hands, buds or fruits with our hands to let the thrips fall on a white sheet of paper and then observe and count with the naked eye or with a magnifying glass.

 

 

Prevention and treatment:

+ Regularly use high-pressure nozzles to spray water on plants to reduce the population of thrips.

+ At the stage when the plant is producing young leaves, buds, flowers, young fruit, etc. If the thrips population is high, the following products can be alternately used: Sago Super 20EC, Fenbis 25EC, SK Enspray 99EC mineral oil (can be used singly or in combination),…

+ Need to pay attention to prevent thrips safely and effectively, people should spray a lot of water, spray thoroughly the underside of leaves where thrips hide, to avoid product resistance, should alternate chemical products of other bases. The product can be used 2-3 times in a row, about 1 week apart each time. Only use products when the population of thrips is high: over 3 - 5 individuals/bud, leaves, fruits and finally, if the plant is flowering, limit spraying, if necessary, spray in the cool late afternoon.

 

 

 

 

 

 

 

 

 

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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.Larvae are very small, oval in shape, newly hatched are bright yellow. Age 2 and age 3 are in green. Age 4 and age 5 are golden brown and 2 small wing sprouts.

 

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.

 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.

 

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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.

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