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通过对稻水蝇危害水稻与产量损失的关系研究,得出了y=3.7945+0.0628x_1-0.0843x_2-0.0783x_3+0.9615x_5±4.0914产量损失预测模型,式中x_1为总虫量头/m~2,x_2为稻穴损失率,x_3为7月上旬茎损失率,x_5为穗损失率;证明水稻穗数损失是造成产量损失的重要原因,从而明确6月上旬水稻返青后期为稻水蝇最佳防治期;确定了经济防治指标为6—10头/m~2;应以农业防治为基础,结合化学防治,防治区每公顷可挽回稻谷1924千克。
Through the research on the relationship between the damage of rice and the yield loss of rice water flies, the yield loss prediction model of y = 3.7945 + 0.0628x_1-0.0843x_2-0.0783x_3 + 0.9615x_5 ± 4.0914 was obtained, where x_1 is the total insect head / m ~ 2, x_2 is the loss rate of rice husk, x_3 is the stem loss rate in early July, and x_5 is the spike loss rate. It is proved that the loss of panicle number is the important reason of yield loss, Good prevention and control; determined economic indicators for the prevention and control of 6-10 head / m ~ 2; should be based on agricultural control, combined with chemical control, prevention and control of hectares of rice per hectare can be recovered 1924 kg.