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研究了不同数量的烟草粉螟繁殖1代和2代(1a)幼虫危害所造成的烟叶重量和叶面积损失以及烟叶的被害率和各级烟叶的伤残率,核算了1~5对烟草粉螟繁殖2代危害所造成的经济损失.结果表明,1,2,3对烟草粉螟繁殖1代幼虫取食的烟叶重量分别为0 53,1 07,2 93g;损失的烟叶面积分别为37 32,75 59,206 34cm2.1,2,3,4,5对烟草粉螟繁殖2代幼虫取食的烟叶重量分别为1 37,3 57,6 30,13 42,24 20g;损失的烟叶面积分别为88 39,230 32,406 45,865 81,1561 29cm2;幼虫取食造成的直接经济损失分别为0 010,0 026,0 047,0 100,0 180元;因伤残降级降价造成的经济损失分别为0 316,1 051,1 932,2 896,4 392元;1a中共损失金额分别为0 326,1 077,1 978,2 996,4 572元.并将供试成虫对数与繁殖2代幼虫取食烟叶重量、损失烟叶面积及经济损失进行理论曲线拟合,经F检验,方程代表性均好.
The damage of leaf weight and leaf area, the damage rate of tobacco leaves and the disability rates of tobacco leaves at different stages of tobacco powdery mildew propagation on larvae 1 and 2 (la) larvae were studied. One to five pairs of tobacco powder The results showed that the weight of the tobacco leaves fed on the 1st, 2nd, 3rd, 3rd instar larvae of the tobacco stem borers was 0 53, 1 07 and 2 93 g respectively; the area of the damaged tobacco leaves was 37 32,75 59,206 34cm2.1,2,3,4,5 Tobacco leaf moths fed on the second generation of larvae weight of 1 37,3 57,6 30,13 42,24 20g respectively; loss of tobacco leaf area respectively 88 39,230 32,406 45,865 81,1561 29cm2. The direct economic losses caused by larvae feeding were 0 010,0 026,0 047,0 100,0 180 respectively. The economic losses due to the degenerative price reduction were 0 316, 1 051,1 932,2 896,4 392 yuan; 1a Chinese Communist Party’s total loss of 0 326,1 077,1 978,2 996,4 572 yuan, and the test of adult logarithm and reproduction of second-generation larvae feeding tobacco Weight, loss of tobacco leaf area and economic loss theoretical curve fitting, the F test, the equation was good.