花生田二代棉铃虫发生为害规律及其防治研究

第2代棉铃虫是危害花生最严重的世代，95％左右的卵产在花生中上部的嫩梢、嫩叶、花萼和茎基上，平均每株落卵19．6粒。在花生上的卵量和幼虫量与第1代蛾量密切相关，卵量（Y1）与第1代蛾量（X）关系式为：Y1＝－315．9＋1．7783X（n=6,r=0.8562)；幼虫量（Y2）与第1代蛾量（X）关系式为：Y2＝31．3＋0．134X（n=6,r=0.8652).在第2代棉铃早产卵初盛期应用B.t菌剂（含孢子100亿个／ml)200倍液喷雾3次，或1．8％齐螨素乳油675ml/hm^2兑水810kg喷雾2次，防效显著。

Occurrence Regulation and Control of the Second Generation Cotton Warm( Heliothis armigera huboner ) on Groundnut

The harm of the second generation cotton warm to groundnut is the most serious, and 95% of eggs are laid on the tender leaves, calyx and the base of stem. There are 19.6 eggs/plant averaged. The relationships between the amount of eggs of the second generation (Y 1),the first generation larva (Y 2) and the first generation moths(x)are: Y 1=-315.9+1.7783X, n=6, r=0.8562 * and Y 2=31.3+0.134X,n=6,r=0.8652 *,respectively. The good results have recieved by using 200 times B.t (Contain the spore 10 billion /ml) spraying or 1.8% Avermection EC 675ml/hm 2 with 810kg water spraying twice in the early and busy stage of laying eggs.