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1984—1986年我们调查了迟栽甘蓝的菜粉蝶卵、幼虫的季节消长情况。10月下旬—11月初为一代成虫产卵高峰,平均每株为8.3粒,11月中旬左右为5.5粒,12月中旬为3.36粒,1月中旬为零。11月中旬为卵孵化高峰,平均每株有3头幼虫,以后随气温下降而下降。90%以上蛹于11月下旬进入越冬,次年3月开始羽化,另有10%左右幼虫在冬季取食嫩叶,能发育为蛹。据此,讨论了对菜青虫的预测办法。
1984-1986 We investigated the seasonality of larvae in cabbage butterfly larvae of the late-planted cabbage. From late October to early November, the spawning peak of a generation of adults averaged 8.3 grains per plant, 5.5 grains in mid-November, 3.36 grains in mid-December and zero in mid-January. In mid-November, the peak of egg hatching, with an average of 3 larvae per plant, decreased with the temperature drop later. More than 90% of the pupae crossed winter in late November and began to emerge in March of the next year. Another 10% of the larvae fed young leaves in winter to develop pupae. Based on this, we discussed the prediction of Pieris rapae.