日本方头甲对桃树桑白盾蚧的捕食作用及抗逆性反应

Predation and Stress Resistance of Cybocephalus niponicus to Pseudaulacaspis pentagona

为保护和利用日本方头甲提供科学依据,研究了日本方头甲的捕食功能反应和抗逆性反应。结果表明,日本方头甲捕食桃树桑白盾蚧量与桑白盾蚧雌成虫、卵及初孵若虫密度呈负加速曲线关系,功能反应属HollingⅡ型,即雌成虫、卵及初孵若虫模拟方程分别为Na=0.366 66 N/(1+0.036 176 N)、Na=0.909 091 N/(1+0.004 753 N)和Na=1.240 601 N/(1+0.017 052 N);日本方头甲成虫随着桑白盾蚧雌成虫、卵及初孵若虫密度的增加,取食量也相应增加,每头日本方头甲成虫对桑白盾蚧雌成虫、卵及初孵若虫的日均最大捕食理论值分别为10.135 6头、191.28粒和72.74头;柴油乳剂、石硫合剂对日本方头甲低毒。

Functional reaction and stress resistance of C. niponicus were mainly studied to provide a scientific reference for protecting and utilizing C. niponicus. The results showed that the relationship between the preying amount of C. niponicus to P. pentagona and the density of the adult and egg plus newly incubated nymph of P. pentagona could be described with a negative accelerative curve. It was fitted to the functional response of Holling type Ⅱ. Respectively： Na ：0. 36666N/ （1 ＋ 0. 036176N） and Na = 0.909091N/ （1 ＋ 0. 004753N） , Na ： 1. 240601N/ （1 ＋ 0. 017052N）. C. niponicus adults with P. pentagona female adults, eggs and newly hatched nymph density increased, consumption also increased accordingly. The theoretical maximum predation numbers of C. nipponicus adults to female P. pentagona adults, eggs and newly incubated nymphs were 10. 1356, 191.28 and 72.74 respectively. Diesel emulsion and lime sulfur had lower toxicity to the adults of C. niponicus.