梨小食心虫在桃树和核桃间转移规律初步研究

为了掌握梨小食心虫Grapholita molesta在新疆和田县桃园和核桃园间的转移为害和种群动态变化规律, 以期确定核桃园内梨小食心虫的最佳防治时间, 同时在桃园和核桃园设立监测点, 通过对梨小食心虫在桃园和核桃园间的发生动态监测以及在核桃园内产卵情况和蛀果率调查, 明确了梨小食心虫在桃园和核桃园间的转移规律。研究发现梨小食心虫在和田县桃园1年发生5代, 越冬代成虫于3月下旬开始出现, 各代高峰期分别在4月上旬、5月中旬、6月下旬至7月上旬、7月下旬至8月上旬、9月上旬, 以第1代和第2代发生为害严重, 具有世代重叠现象。梨小食心虫在核桃园1年发生2代, 成虫产卵于核桃果实和叶片, 主要以幼虫为害果实。于6月下旬开始从桃园向核桃园转移, 8月下旬又从核桃园转移至桃园, 具有明显的寄主转移规律。7月初为核桃园内梨小食心虫的防治关键期。

Preliminary study on the transfer pattern of Grapholita molesta between peach and walnut orchards

To determine the best time window for G.molesta control in walnut orchards, the transfer damage and population dynamics of Grapholita molesta between peach and walnut orchards in Hotan county was studied. Monitoring sites were set up in both peach and walnut orchards. Occurrence dynamics of G.molesta between peach and walnut orchards were monitored, and egg-laying situation and fruit decay rate were investigated in walnut orchards. The results indicated that there were five generations of G.molesta in one year in peach orchards in Hotan county. Overwintering adults started to appear in late March, and adults of each generation peaked in early April, mid-May, late June to early July, late July to early August and early SeptembeR. The first generation and the second generation occurred seriously, with the phenomenon of overlapping. Two generations occurred in walnut orchards in one year, with adults laying eggs on walnut fruit and leaves, mainly with larvae harming the fruiT. In late June, it started to move from the peach orchard to the walnut orchard, and in late August it moved from the walnut orchard to the peach orchard, with an obvious pattern of host transfeR. Early July is the critical period for G. molesta control in the walnut orchard.