论文部分内容阅读
为了明确甘蓝夜蛾对大豆叶片的取食量,深入研究其取食为害规律,试验采用离体叶片单头饲养法,在室温26~27℃条件下观察了甘蓝夜蛾各虫态发育历期并测定了其各龄期幼虫取食量。结果显示:甘蓝夜蛾卵发育历期平均需3.64 d,幼虫共6龄,其发育历期需17.88 d,预蛹期需1.85 d,蛹期需13.78 d。各龄幼虫的头宽与体长均随着龄期的增长而增大,头宽与体长的生长模型分别为y头宽=0.119x2-0.203x+0.438(R2=0.998);y体长=0.872x2-0.224x+2.073(R2=0.998);甘蓝夜蛾幼虫累积取食量与发育龄期的关系模型为y=4.93e1.30x(R2=0.995)。整个幼虫期每头幼虫可累计取食大豆叶片面积为12 918.16 mm2。其中4~6龄幼虫的取食量占整个幼虫期取食量的97%以上。
In order to clarify the feeding amount of Soybean leaf to soybean leaf, the in-depth study on its feeding and damage was carried out. The leaf blade single-head feeding method was used to observe the developmental stages of the cabbage budworm at 26 ~ 27 ℃ The larval feeding amount of each age was measured. The results showed that the average developmental period of C. lariatus eggs was 3.64 days and the larvae were 6 years old. The developmental period was 17.88 days. The pre-pupal stage was 1.85 days and the pupal stage was 13.78 days. The head width and body length of all larvae increased with the increase of age. The head width and body length growth models were y head width = 0.119x2-0.203x + 0.438 (R2 = 0.998) = 0.872x2-0.224x + 2.073 (R2 = 0.998). The model for the relationship between the cumulative feeding amount of larvae of Brassica campestris and developmental age was y = 4.93e1.30x (R2 = 0.995). The total larvae per larvae could accumulate soybean leaves area of 12 918.16 mm2. Among them, the feeding amount of 4 ~ 6th instar larvae accounted for more than 97% of the total larval feeding amount.