二代棉铃虫卵的分布特点及防治对策王玉堂山东省东平县农委艺师（２７１５００）二代棉铃虫卵在棉株上具有高度集中分布的特点，大约５０～７０％的卵量和５０～８０％的初孵幼虫都集中在顶心、旁尖上。据调查，在３４８粒卵中，叶片正面占７３．４％，叶背占４．０％，叶... Second generation cotton bollworm eggs distribution characteristics and prevention and control measures Wang Yutang Shandong Dongping County Agricultural Committee (271500) The second generation of cotton bollworm eggs in cotton plants have a highly concentrated distribution of about 50 to 70% of the amount of eggs and 50 ~ 80% of newly hatched larvae are concentrated in the top heart, next to the tip. According to the survey, 348 of the eggs, leaves frontal accounted for 73.4%, leaf back accounted for 4.0%, leaves ...