The scientific name Pseudodendrothrips mori (Niwa) is from the order of Thysanoptera, Thripidae. Alias ​​mulberry horse, cercariae. Distribution of Liaoning, Henan, Hebei, Shandong, Shanxi, Anhui, Jiangsu, Zhejiang, Sichuan, Guangdong, Taiwan and other places.
The main sang.
Damage characteristics, nymphs use mouthparts to suck the suction blade or petiole and twig skin sap, after the victim was a white transparent pit, after browning, hardened or deformed leaves, severe leaf curling or shedding. More damage from the tip of the 4-7 leaves, in the mulberry garden evenly distributed. The worm was a minor pest in Sangzhi District in Huzhou, Zhejiang Province in the 1960s. In the 1970s, it was aggravated. In the past 10 years, it has become the main mulberry leaf pest in the silkworm area. The damage to the heavy mulberry garden caused difficulty in feeding in summer and autumn, and silkworm cocoon could not harvest. , resulting in "bugs and catastrophes."
Morphological characteristics Adult body length 0.8mm, spindle-shaped, light yellow. The front of the head and tentacles are gray-yellow to pale yellow, and the head is wide. The two compound eyes protrude from both sides of the head. Compound eye dark red, 2 pairs of wings long and transparent, surrounded by armpit hair, chest shorter than the head, the base of the chest slightly thick and uplift, there are l wings. Egg length 0.02mm, kidney-shaped, colorless and transparent. The newly hatched nymphs are about 0.22 nm in length, are colorless or nearly colorless, the second instar nymphs are light green, the third instar is yellowish green, the fourth instar is 0.8 mm long, orange, and the nymphs are wingless, similar to adults.
Life habits Jiangsu and Zhejiang Sang district, 9-10 generations old, Anhui l0 generation or so, with adults in the grass weeds Lee's Leech or litter and bark seam winter. In late spring, after the young leaves are drawn out, they migrate to the mulberry tree to damage and spawn. The eggs are prolific in the shoot 1 l dorsal or vein tissue, a l grain. 50 to 70 eggs per female, egg period 5-7 days, nymph period 10-13 days, adult life of 7 days or so. The insects like hot and drought, from hatching to 9-15 days of the nymph period, from the beginning of the peak to the peak day takes about 4-7 days, the main damage season in July-August. The generation of nymphs in each generation occurred in early May, early June, late June and early July, mid-July, early August, late August, mid-September, and mid-October. In the North China area, 3-6 generations were seriously damaged and overlapped from generation to generation.
Control methods (1) selection of insect-resistant varieties. (2) Clean mulberry in autumn and winter, and remove weeds during the growing season. (3) According to the prediction of timely medication. A generation of general population density is not to be avoided. The second generation is concentrated on mulberry seedlings or spring mulberry trees. It is a peak period of damage. Three generations occur in the rainy season without drugs. The fourth generation and later generations have large quantities and should be sprayed in time. % of methomyl EC or 40% Dimethoate 1000 times, 50% phoxim 1500 times, 20% imidacloprid 3500 times, 10% Distilled 2000 times, 40% % Irradioside Net Emulsion or 80% Dichlorvos EC 1000x, 5% Ruigen Perfusate 1000x. The application of production should be divided into different sections, medications in phases, strict safety intervals, and ensure the safety of silkworms.
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