Soybean aphid pest commonly known as tired , honey worms. Mostly concentrated in soybeans growing point , parietal , young surface of leaf , sucking sap hazards. Cause leaf curl, dwarf plants , reducing yields , but also spread the virus disease, resulting in cuts and reduced quality . This insect six months late emergence in soybean fields , high temperature and drought when serious harm.
Soybean aphid reproductive capacity is large, a female can reproduce 50-60 , in conditions suitable cases, a small aphid after about 4-5 days to calving, year on soybean can multiply 15 generations .
Soybean aphids have four times annual migration diffusion peak ; 1st in soybean seedling stage , the second is to appear in early June , the 3rd appeared in mid-July, 4th in early September . Should generally be in early July to prevent and treat the most appropriate.
Control methods: chemical control -based, with 40% Dimethoate EC 800 times , or 40% omethoate EC 1000 times .agricultural sprayers 10% permethrin EC bromofluoroacetate 15-20 ml per 667 square meters , 50% pirimicarb WP 10 grams per 667 square meters , watered 40-50 kg spray.
Soybean pod borer prevention
Soy bean borer is a small bite bloodworms . Larvae bore into the pods , bite the tender bean pods can be eaten half granule , reducing yield and quality . This worm one generation to the old larvae overwinter in cocoons ground beans . 2nd year in late July into a pupa and moth flew pods spawning more than 7- August rainfall , soil moisture , is conducive to happen.
Control methods:
( A ) agricultural control . Selection of insect-resistant varieties, crop rotation, timely harvest , timely back yard .
( 2 ) chemical control. With 5% phorate granules 750-1000 grams mixed with soil 10 kg , 10 August , sprinkle in the field , every four ridge sprinkle a ridge , or 80% dichlorvos ,bottle sprayer 667 square meters with 100 ml each , the Baptist dipped 20 cm long sorghum or corn stalk stalk 50 every five ridges inserted a ridge , every 7-8 insert a step .
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