向日葵螟简称葵螟,在东北各地均有发生,以幼虫蛀食种子和葵盘,严重影响向日葵的产量和品质。据近2年调查:子粒虫食率最低的地块为11.2%,最高的可达40.6%。因此,要重视对葵螟的防治。 1、药剂防治:①在8月10日幼虫危害初期;用90%敌百虫或50%巴丹500倍液;或20%杀灭菊酯或2.5%.溴氰菊酯300倍液;或BT乳剂300倍液进行喷雾,每个花盘喷40—50毫升,第一次喷药后隔5-7天再喷一次,效果更好。②在7月末8月初成虫盛发期,在夜间 Sunflower borer, or Kwai borer, occurs in all parts of the northeast of China and infests larvae with seeds and sunflower discs, which seriously affect the yield and quality of sunflower. According to nearly 2 years of investigation: the lowest feed rate of grain worms 11.2%, the highest up to 40.6%. Therefore, we should pay attention to the prevention and treatment of Kwai borer. 1, the chemical control: ① August 10 larvae early damage; with 90% trichlorfon or 50% of the 500 mg of Bataan; or 20% fenvalerate or 2.5% deltamethrin 300 times; or BT emulsion 300 times spray, each flower plate spray 40-50 ml, after the first spray 5-7 days after spraying again, the better. ② at the end of July early August adult Sheng period, at night