论文部分内容阅读
栗瘿蜂在一定区域内呈周期性发生，十年左右暴发一次，大发生持续2－3年，可自然“消退”。影响栗瘿蜂发生的主导因素是寄生性天敌，中华长层小蜂是最主要的天敌种群，两者相辅相承、相互制约。它们之比称益害比，益害比低时，栗瘿蜂虫口直线上升，直至大发生；益害比1：5左右时，可抑制栗瘿蜂大发生，仍造成一定的为害；益害比在1：5以上时，可控制栗瘿蜂的发生。益害比可作为栗瘿蜂发生预测指标。
Chestnut bee bees periodically occurred in a certain area, an outbreak in about 10 years, the occurrence of large 2-3 years, can naturally “subsided.” The dominant factor that affects the occurrence of the chestnut bee is the parasitic natural enemies, the Chinese long-horned wasps is the most dominant natural enemies, both of which complement each other and restrict each other. The ratio of their benefit and harm than the ratio of benefit is low, the chestnut bee caterpillar mouth straight up until the great occurrence; benefit ratio of about 1: 5, can inhibit the occurrence of chestnut bee giant, still cause some damage; Than in 1: 5 above, you can control the occurrence of chestnut bee. Benefit ratio can be used as predictors of chestnut bee occur.