Prevention and control of diseases and insect pests of mango thrips

Classified Coleoptera, thrips (Thripidae).

1. Tea yellow thrips ScirtothuipsdosalisHood

1. Harm

The leaves of mango trees damaged by adult and nymphs were scalded by hot water and finally wilted, resulting in brown rough spots on the surface of the fruits. This insect is also harmful to tea trees, bananas and other crops.

2. Morphological characteristics.

The adult body is about 1.0┨ long, yellow, the wing is narrow, long, gray and transparent, the wing margin is hairy, the head width is about 1.8times of the length, the compound eye is slightly gray and black, the single eye is bright red, the antennae are saved as 3 times the length of the head, the width of the forechest is 1.5 times of the length, and the posterior edge has a pair of thick and short thorns.

Egg yellowish, kidney-shaped.

The nymph is milky white when it is first hatched, then becomes yellowish, and looks like an adult.

3. Life habits

The annual occurrence algebra is unknown. The first generation can be completed in more than 10 days when the temperature is high. Both adults and nymphs can damage leaves and fruits; the color of the injured leaves becomes lighter, like hot water scald, and the maximum number of insects in a leaf is 19. The damaged fruit surface shows brown linear lines or markings, causing the fruit surface to be rough and thus reduce the commercial value. This insect is harmful when the mango fruit is soybeans. Usually, the insect body is hidden under the sepals, and when the damage is serious, the small fruit can be withered. The appearance of the injured small fruit shows brown lines (spots). As the small fruit grows, these lines (spots) grow thicker as the fruit grows, and the fruit surface becomes rough when the fruit is ripe.

4. Prevention and control methods

When the insect is found to be harmful, it can be sprayed with 2000 times of dichlorvos or 40% of dimethoate, or 4000 times of 2.5% of dichlorvos or dimethoate. In severe cases, spray once every 7 days, 3 times in a row.

2. Red band thrips Selenothripsrubrocinctus (Giard)

1. Harm

Adult and nymphs damage the leaves of mango seedlings, showing numerous dirty black spots, leaf tips blackening, leaf edges curling, and finally all the leaves fall off, and the whole plant dies; this insect still discharges red liquid feces on the leaves, showing rusty brown or black shining spots after it dries up, affecting photosynthesis. The insect is also harmful to rubber, coffee, cashew nuts, litchi, longan, citrus and other crops.

2. Morphological characteristics.

The adult is long, dark brown, with a body length of 1.0ml 1.5 ┨ and a dense gray-black hairy wing margin.

Ovoid-kidney-shaped, yellowish-white, about 0.25 ┨ long.

The nymph is long and yellow, with a bright red ribbon at the base of its abdomen and a body length of about 1.0 ┨ when it is fully grown.

The pupa is long, with a body length of about 1.0 ┨. It is similar to a nymph in shape, but has fully developed wing buds.

3. Life habits

It takes place about 10 generations a year. The female adult is parthenogenetic and lays eggs on the lower surface of the leaf with a drop of fecal-like substance. The egg stage is 3 days and the pupa stage is 6 days. Adults and nymphs often live in depressions or grooves near the main vein, often raising the end of the abdomen with a spherical droplet at the end.

4. Prevention and control methods

When it occurs, 40% dimethoate or 50% fenitrothion or 80% dichlorvos 1500 times solution can be sprayed to control.