果园种植绿肥对天敌和害虫群落及种群消长的影响

试验研究了果园种植绿肥对天敌和害虫群落及种群消长的影响。结果表明 ,种植绿肥的果园天敌种类和数量明显多于清耕园 ,天敌种类至少 2 3种 ,绿肥园树上天敌数量平均每株次有 1 .82头 ,清耕园平均每株次有 1 .1 5头 ,绿肥园比清耕园高 5 8.3%。 1 999、2 0 0 0、2 0 0 1年绿肥园平均每次每平方米地面天敌数量分别是清耕园的 80倍、1 8倍、42倍。绿肥园害虫发生期比清耕园推迟 7d ,且峰值平均降低 39% ,桃小食心虫的卵果率下降 1 .1 4%。

Effect of Planting Green Manure in Apple Orchard on Natural Enemy,Pest Community and Population Variation

Results from the experiment in 1997-2001 showed that there were more than 23 kinds of natural enemy in orchard with green manure, which was higher than that in the orchard with raw grass. There were 1.82 pests on each tree in the orchard with green manure, being 58.3% higher than that in the orchard with raw grass (1.15 pests on each tree). The amount of natural enemy in the orchard with green manure was 80 times, 18 times and 42 times of that in the orchard with raw grass every square meters resp. in 1999, 2000 and 2001. The pest happening period in the orchard with green manure postponed 7 days and the top value decreased by 39% on average. The amount of fruit with eggs of peach fruit borer was decreased by 1.14%.