几种植物生长物质对松树枝梢生长的调控及对枝梢害虫的防治

采用CEPA、GA3、PP333、B9等植物生长物质,以不同浓度处理马尾松、黑松、湿地松、火炬松枝梢,比较药剂种类和处理浓度对枝梢生长的影响。结果表明: GA3(2 500 mg·L-1)对各供试树种均有显著促进作用(试验3中对湿地松除外);试验1中,5 000 mg·L-1 PP333显著抑制马尾松枝和黑松枝的伸长生长,具有最佳调节效果;试验2中,5 000 mg·L-1 PP333显著抑制湿地松和马尾松枝的伸长生长,具有最佳调节效果;试验3中,5 000 mg·L-1 PP333＋5 000 mg·L-1B9复合制剂显著抑制湿地松和火炬松枝梢的伸长生长,具有最佳调节效果。用"Y"型嗅觉仪测定微红梢斑螟成虫对松梢的嗅觉反应,结果表明处理组枝梢对微红梢斑螟成虫驱避效果明显;微红梢斑螟等松梢害虫危害率调查表明,处理枝梢的被害率也明显低于对照枝梢。

Regulation of Several Plant Growth Substances on Pine Shoot Growth and Their Effects on Shoot Pests Controlling

The CEPA , GA_3, PP_(333) and B_9 were sprayed on the shoot needles of Pinus massoniana, P. thunbergii, P. elliottii and P. taeda with different concentrations in order to observe their effects on pine shoots growth.The results showed that GA_3 (2 500 mg·L~(-1)) promoted the shoots length of all species significantly (except to P. elliottii. in Experiment 3). In contrast, the shoots length of P. massoniana, P. elliottii and P. thunbergii were restrained significantly by PP_(333) (5 000 mg·L~(-1)), and the shoots length of P. elliottii and P. taeda were restrained significantly by the complex preparation of 5 000 mg·L~(-1) PP_(333) and 5 000 mg·L~(-1) B_9 (1∶ 1),in different experiments. And they were the best growth substances for each specie. The tropism responses of Dioryctria rubella to the volatiles of pine shoots were investigated with "Y"-tube olfactometer, the results were obvious compared with CK. The field survey showed the damage rate of the treated pine shoots were lower than that of control obviously.