Cotton cotton field smoke horse
Scientific name Thrips tabaci Lindeman Thysanoptera, Thripidae. Alias ​​cotton horses, guaran horses. Distributed several times across the country.
Host cotton, onion, garlic, apple, plum, plum; grape, orange, strawberry, pineapple, tobacco and so on.
The characteristics of damage with cotton flower hummer.
Morphological characteristics Adult body length 1. O-1.3mm, yellow brown, dark back. Antennae are 7 knots, compound eye is purple, 3 are monocular, and a pair of short beaks are on both sides. The wings are long, narrow and transparent. There are 13 lines on the anterior vein and 13 lines arranged in 3 groups. On the posterior vein, there are 15-16 lines and they are evenly arranged. Egg white, 0.2-0.3mm long, kidney-shaped. If the insect body is yellowish, the antennae are 6 knots, and the 4th segment has 3 rows of micro-hairs, and the chest and abdomen have fine brown spots on the sections, and raw hairs are on the points. The 4th-age wing buds are obvious, and no feeding can be active.
Life habits are 3-4 generations in North China, 6-10 in Shandong, and more than 10 generations in South China. Most of the adult or nymphs in the soil in the cotton field or unharvested onions, garlic sheaths and weeds overwintering, a small number of earthworms in the soil in the winter. Spring onions and garlic turn green to resume activities. After a period of damage, they fly to cotton and other crops for breeding. May-June is the height of damage. Adults are active, able to fly fast, spread quickly, hi to hide in hidden places during the day, damage at night or on cloudy leaves, multiple line of parthenogenetic reproduction, males are rare. Eggs are prolific in the subcutaneous leaf veins or veins, egg period 6-7 days. The newly hatched nymphs are not active and are mostly concentrated on the sides of the leaf veins on the back of the leaves. Normal temperatures are below 25°C, relative humidity is below 60%, and insects are visible in the same period from July to August. They enter the September insects. The amount was significantly reduced. Before the onset of early frost in October, a large number of horses moved to onions, garlic, cabbage, radish and other vegetable fields. Weedy cotton fields or wintering hosts of cotton and thrips intercropping, interplanting or adjoining cotton fields in early spring, smoke thrips occur early, and it is seriously detrimental. The main natural enemies include florets melted, pheasants and striped hummocks.
Prevention and control methods 3 true leaves before the first 100 strains of insects 10, 4 true leaves after 100 strains of insects 20-30, began to control. Specific methods see cotton field flower thrips.
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