二条叶甲(Monolepta nigrobilineata Mots.)以前一直在大豆上发生,但仅作为次要性害虫而未被人们重视。1989年龙亢农场有500亩大豆受此虫危害,由于防治不及时,豆英少,发倒青,推迟20多天收割,由于收割时仍不太熟,减产6-7成损失大豆5万公斤,1990年发生地块扩大到5000亩,平均每平方米有虫100头以上,最高达350头。由于防治得法,除个别地块外,一般未造成大的损失。 Monodon (Monolepta nigrobilineata Mots.) Has been on soybeans for years, but has not been valued as a secondary pest. Longchang farm in 1989 500 acres of soybean by the insect hazards, due to prevention and treatment is not timely, less beans, fat green, postponed more than 20 days of harvest, harvest is still not yet cooked, cut 6-7 into a loss of 50,000 soybean Kg, land parcels occurred in 1990 expanded to 5000 acres, an average of more than 100 per square meter insects, up to 350. Due to the prevention and control of the law, apart from individual plots, there is generally no major loss.