Cotton crops are an important agricultural product in Egypt. However, the bollworm Earias insulana is a significant pest of cotton. Field experiment was carried out during the 2018 and 2019 seasons at Qaha Experimental Station, Qalyoubia governorate to determine the best dates for sowing cotton crops, to minimize E. insulana infestation and maintain high populations of the predators of spiny bollworm. The latest sowing date had a significantly lower infestation of squares, flowers and green bolls than the other two sowing dates. After spraying the three planting date plots with profenofos, lambda-cyhalothrin and methomyl insecticides, infestation of cotton bolls by spiny bollworm was significantly reduced in treated compared with untreated plots. A significant positive correlation (r = 0.829* and 0.827*) was found between the average temperature and E. insulana infestation of squares and flowers, respectively, for the first planting date and (r = 0.819*) in squares for the second planting date of untreated plots of season 2018. The explained variance percentages of multiple regression analysis showed that the effects of mean temperature and relative humidity (RH) on the third sowing date had a significantly lower infestation of squares, flowers and green bolls by spiny bollworm as compared to the first and second sowing dates. The populations of common natural enemies of E. insulana on cotton plants, i.e., Chrysoperla carnea, Coccinella undecimpunctata and spiders were counted during the two seasons. The correlation between the RH percentage and populations of the three predators was insignificantly positive during the 2018 season, while it was negatively or positively insignificant during the 2019 season. The correlation between the mean temperature and the populations of the three predators was insignificantly negative for C. carnea and positive for spiders during the 2018 season, whereas a positive correlation was found between temperature and C. carnea and spiders and a negative correlation between temperature and C. undecimpunctata during the 2019 season.

棉花作物是埃及重要的农产品。然而，棉铃虫Earias insulana是一种重要的棉花害虫。2018 年和 2019 年季节在 Qalyoubia 省 Qaha 试验站进行了田间试验，以确定播种棉花作物的最佳日期，以尽量减少E. insulana侵染并维持多刺棉铃虫捕食者的高种群。与其他两个播种日期相比，最近的播种日期对方块、花朵和青铃的侵染率明显较低。在三个种植日期地块喷洒丙溴磷、高效氯氟氰菊酯和灭多威杀虫剂后，与未处理的地块相比，处理的棉铃虫对棉铃虫的侵染显着减少。显着正相关（r = 0.829* 和 0.827*) 发现在平均温度和E. insulana之间分别在第一次种植日期和未处理地块的第二个种植日期的正方形和花朵的平方和 ( r = 0.819*) 之间2018. 多元回归分析的解释方差百分比表明，平均温度和相对湿度（RH）对第三播期的影响，与第一和第二次相比，刺铃虫对方块、花和青铃的侵染显着降低播种日期。棉株上常见的E. insulana天敌Chrysoperla carnea , Coccinella undecimpunctata 的种群在这两个季节里，蜘蛛被数了数。3种捕食者的相对湿度百分比与种群数量之间的相关性在2018年季节呈不显着正相关，而在2019季节呈负或正不显着。在 2018 年季节，平均温度与三种捕食者种群之间的相关性对C. carnea呈负相关，对蜘蛛呈正相关，而温度与C. carnea和蜘蛛呈正相关，与温度和蜘蛛呈负相关。C. undecimpunctata在 2019 年的季节。