Scientific name Serica orientalis Motschulsky Coleoptera, Scarabaeidae. Synonyms Maladeraorientalis Motschulsky, Aserica orientalis Motschulsky.
Host beets, hemp, mulberry, vegetables, fruit trees.
Injury features adult leaves, larvae eaten tender roots. It is one of the major pests of sugar beet seedlings.
The morphological features can be seen in the hemp pest, a black velvet beetle.
Living habits 1 generation per year, mainly wintering adults in the soil, unearthed in April of the following year, entering the peak period from late April to mid-June, spawning from May to July, egg period 10 days, larvae damage to 8 After mid-September and mid-September, the old quail was cooked and the pupa period was 15 days. After the eclosion, the larvae were overwintering. When the temperature in early spring is low, the adults mostly move during the day and feed on the early germinating weeds, trees, and vegetables. The adult animals have weak activities, crawling on the ground, rarely flying, and buried at dusk in wet soil junctions. When the summer heat temperature is high, it is more than the evening activity. After 16 o'clock, it begins to unearth and the cluster damages in the evening. After the sugar beet seedlings were unearthed from late April to May, a large number of adults migrated to the sugar beet to damage the beet cotyledons, the young leaves and the growing point, and severely eaten the sugar beet seedlings, resulting in the lack of seedlings and ridges. Enter the flood season. Adults are bred and mated. Eggs are prolific in 10 cm deep soil layers. They are produced by heap production. Each pile of eggs has 2-23 eggs, mostly about 10 eggs. Each egg produces 9-78 eggs. The adult period is long and the duration of the damage is 70-80 days. The newly hatched larvae damage the roots of fruit trees and vegetables in the soil and the larval period is 70-100 days. After aging, 20-30cm soil building room phlegm.
Prevention and control methods (1) Treating sugar beet Weevil while treating seeds with methylthiophosphorus can treat black cashew beetle and keep seedlings for 90%. (2) During the first half of May, when the black cashmere beetle infested the seedlings, spray 50% parathion EC every 60 ml of 667m2 or 35% methylthiophosphorus EC 60 to 70 ml, 5% methyl parathion per 667m2 1 .5kg.
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