栾多态毛蚜生物学特性及防治的研究

STUDIES ON THE BIONOMICS OF PERIPHYLLUS KOELREUTORIAE (TAKAHASHI) AND ITS CONTROL

Periphyllus koelreutoriae (Takahashi) has 5 generations one year and hibernates in eggs.The thriving occurance periods of each generation are as follows: The first generationfundatrices from the last ten days of March to the first ten days of April; the second gen-eration fundatrigenia (wingless aphids largely) in the last ten days of April; the: third gen-eration parthenogentic vivipara (winged aphids largely) in the first ten days of May: theforth generation diapause aphids in the second ten days of May; the fifth generationsexuales from the last ten days of October to the first ten days of November, and theovipositing in the second and last ten days of November. The average fecundities of a single aphid from the first to the third generation are 14~25, the average life periods are 20~26 days. By means of spraying leaves and smearing stems, good effects of chemical control couldbe got. At the right control time, Phoxim, Monocrotophus and Omethoate etc. were used,and the control effects were ideal.