番石榴嫩梢害蟲發生消長及其防治

Abstract

番石榴之嫩梢害蟲，民國72-73 年經於本省南部調查，主要有下列四種：（一）棉蚜（Aphis gossypii Glover）於番石榴園內全年發生，其棲群高峰期在12 月-3 月間，低峰期在7-10 月間。（二）番石榴白粉蝨（Aleurotuberculatus Psidii Singh ）於年中有二次高峰期，即8-9 月及n-12 月間，低峰期在1-6 月間。（三）小綠葉蟬（Empoasca boninensis Matsumura ）發生高峰期在7-10 月間，低峰期在12月-4 月間。（四）節角捲葉蛾（Spilomota rhothia Meyricll ) 發生高峰期在3-5 月間，低峰期在7-10 月間。修剪防治小綠葉蟬及節角捲葉蛾有效，對棉蚜及番石榴白粉蝨於修剪後再噴施90% 納乃得W. P.防治效果優異。 Four major shoots insects on guava were investigated from 1983 to 1984 in southern Taiwan. (1) cotton aphid, Aphis gosssypii Glover, occurred all year round on guava orchard and its population density peaked between DEC. and next MAR., lowered from JUL. to OCT.. (2) white fly, Aleurotuberculatus psidii Singh, had two peaks one year, one was from AUG. to SEP., another from NOV. to DEC. and lowered from JAN.. to JUN. (3) green leaf hopper, Empoascab oninensis Matsumura, peaked from JUL. to OCT. and lowered from DEC. to next ARP. and (4) leaf roller, Spilomota rhoihia Meyrich) peaked from MAR. to MAY. and lowered from JUL. to OCT. Both pruning and spraying 90% Lannate WP showed the most effective in checking the shoot insects on guava.