竹提取物对玉米象Sitophilus zeamais Motsch.生物活性的初步研究

Bioactivities of Extracts from Bambooagainst Sitophilus zeamais Motsch.

研究了 10种竹子提取物对玉米象种群形成的抑制作用和驱避作用。结果表明 ,灰水竹和短穗竹提取物对玉米象成虫的驱避效果较好 ,72 h驱避等级达到 级 ,平均驱避率分别为 77.4 4%和6 4.84 %。应用索氏抽提法所得到的灰水竹提取物对玉米象成虫的驱避作用明显强于间歇振荡法所得到的提取物 ,驱避中浓度分别为 0 .9994 g/L。 10 g/L的竹提取物对玉米象种群形成的抑制作用不明显 ,只有白纹短穗竹提取物对玉米象种群的抑制率达到 5 0

The extracts of P. platyglossa and B. densiflorum showed fairly good repellencies to adult Sitophilus zeamais Motsch., the repellence class of which attached class Ⅳ at a concentration of 10 g/L, the average rate of repellencies were 77.44% and 64.84% (72h), respectively. The extract of P. platyglossa by Soxhlet method showed stronger repellence than extract obtained by Intermittent Shaking. Their repellence median concentrations were 0.9994 g/L and 1.8905 g/L, respectively, the regressive equations were Y = 0.7346 X +4.265( r =0.9938) and Y =0.6819 X +4.1295( r =0.9993). At a concentration of 10 g/L, the extract of bamboo exhibited unremarkable fecundity inhibitory effect against Sitophilus zeamais M.. Only the inhibiting efficacy of extract from Brachystachyum albostriatum was above 50%. The result showed significant pofenfial to exploit the environment friendly pesticide and to utilize the resources of bamboo.