植物次生代谢物烟碱对马铃薯块茎蛾生长发育的影响.

Phthorimaea operculella is an important quarantine pest. In this research, the effects of nicotine on the larval weight, pupa weight, and larval development duration of P. operculella were evaluated after continuous feeding with artificial diets containing plant allelochemicals nicotine from the second and third instars for five generations. The results showed that larval development was delayed and the growth of larval was significantly inhibited after nicotine treatment. Compared to the control, the inhibition rates of larval weight and pupal weight declined from 45 % to 20 % and 25 % to 4 %,32 % to 17 % and 28 % to 5 % after the 2nd instars and 3rd instars feeding with nicotine for five generations. Nicotine could delay the larval growth and development of P. operculella and showed more inhibited effect on the younger larvae. With increasing of generations, inhibition of nicotine was reduced to larval weight and pupal weight, and larval development period and the pest whole development period were shortened. This study showed that plant allelochemicals could affect the growth and development of the P. operculella,but P. operculella could realize self-regulation after a few generations by gradually increasing the adaptability of nicotine toxic substances and alleviating inhibition of toxic substances as well. [ABSTRACT FROM AUTHOR]