To clarify the adaptability of Chinese pear psylla Cacopsylla chinensis on non-host overwin-tering plants,dormant twigs of apple,peach,cherry,plum,and hawthorn were selected. The preference and oviposition behavior of the winter form of Chinese pear psylla on different plant combinations were tested under selective conditions. Additionally,the survival rate,oviposition,and mortality of the winter form of Chinese pear psylla after plant switching were investigated under laboratory condition. Results under selective conditions showed that,when the host plant was present,the winter form of Chinese pear psylla exhibited a preference for pear twigs (24.29％ ),followed by apple (25.76％ ),peach (20.81％ ),plum (13.26％ ),apricot (8.25％ ),cherry (4.01％ ),and hawthorn (3.62％ ) twigs. The average number of eggs laid on pear and apple twigs was 111.00 and 7.67,respectively,with no eggs found on other fruit tree twigs. In the absence of a host plant,the preference ratio of winter form of Chinese pear psylla for apple twigs (35.45％ ) was significantly higher than that for cherry (15.96％ ),apricot (13.19％ ),peach (13.05％ ),hawthorn (12.41％ ),and plum (9.95％ ). The average number of eggs laid on apple,cherry,plum,peach,apricot,and hawthorn twigs was 14.25,9.75,7.25,4.75,2.75,and 1.00,re-spectively,with a decrease in the total egg numbers. Under non-selective condition,the median lethal time of winter form of Chinese pear psylla on pear tree twig was 17.11 d,while other non-host plants,it ranged from 7.00 d to 9.00 d. The cumulative number of eggs laid by winter form of Chinese pear psyl-la on pear tree twigs was the highest (136.67) over 14 days,whereas on apple,cherry,peach,apricot,hawthorn,and plum tree twigs,it was significantly reduced (41.00,11.30,5.33,1.00,1.00,and 0.67,re-spectively). The egg hatching rate was highest on pear twigs (74.26％ ),followed by apple tree twigs (24.80％ ),while eggs laid on other fruit tree twigs rarely hatched. Survival of winter form of Chinese pear psylla was less affected when transferred from non-host apple tree twigs to host pear tree twigs,with a cumulative mortality of 13.33％ on the 8th day. On the contrary,survival was significantly affect-ed when transferred from host pear tree twigs to non-host apple tree twigs,with a cumulative mortality of 81.67％ on the 8th day. In summary,the tested non-host plants were found inadequate to meet the sur-vival and offspring development needs of the winter form of Chinese pear psylla and could only serve as temporary substitutes or overwintering transition hosts. Apple,a non-host plant,could be used as a le-thal trap plant for the control of winter form of Chinese pear psylla.
维普
万方数据
