庚醛与桉叶油醇组合对马铃薯块茎蛾产卵选择的影响

马铃薯块茎蛾(Phthorimaea operculella)是世界上为害马铃薯最严重的害虫之一,本研究利用桉叶油醇与庚醛驱避-引诱组合对其产卵行为进行调控,以探究最佳驱避-引诱组合规律及影响因素。在室内条件(27±1℃,L∥D=14h∥10h,RH:50%~70%)测定了桉叶油醇与庚醛单组分及两种组分驱避-引诱组合对马铃薯块茎蛾产卵选择的影响。桉叶油醇在6~12mg/L浓度范围内对马铃薯块茎蛾表现为产卵引诱作用,在18~30mg/L浓度范围内则表现为产卵驱避作用;庚醛在6~30mg/L浓度范围内对马铃薯块茎蛾表现为产卵驱避效果。将对马铃薯块茎蛾产卵行为引诱效果较好的桉叶油醇(3,6,12 mg/L)与驱避效果较好的庚醛(12,18,24mg/L)进行引诱-驱避组合,12mg/L庚醛与3mg/L桉叶油醇push-pull组合效果最好,push-pull效应达36.6%。对马铃薯块茎蛾产卵行为调控最佳的驱避-引诱组合为最低驱避浓度(12mg/L庚醛)与最低引诱(3mg/L桉叶油醇)浓度组合。产卵选择指数和push-pull效应与交配率、单雌产卵量不具有相关性,但是浓度变化可以导致交配率和单雌产卵量的变化。

Effects of combination of cineole with heptanal on oviposition choices of the potato tuber moth, Phthorimaea operculella

The potato tuber moth (PTM),Phthorimaea operculella is one of the major pests causing severe dam-age to potatoes.Plant secondary metabolites were used to regulate the oviposition of PTM,in order to understand the regular pattern of push-pull combinations and their influencing factors.The oviposition choices of PTM on po-tato tubers treated with different single concentrations and push-pull combinations of cineole with heptanal were meas-ured under laboratory conditions (27±1℃,L∥D=14 h∥10 h,50%-70% RH).The results indicated that cineole at-tracted the oviposition of PTM at low concentrations from 6 mg/L to 12 mg/L,but repelled it at higher concentrations from 18 mg/L to 30 mg/L.Heptanal had a significant repellent effect on the oviposition at the concentrations from 6 mg/L to 30 mg/L.By combining cineole with better pull effect (3 mg/L,6 mg/L,12 mg/L)with heptanal with better push effect (12 mg/L,18 mg/L,24 mg/L)to oviposition of PTM,the combination of heptanal (12 mg/L) with cineole (3 mg/L)showed the best push-pull effect (36.6%)on the oviposition.The results suggested that the best push-pull combination to oviposition of PTM was the combination of the lowest pull concentration (3 mg/L cineole)with the lowest push concentration (12 mg/L heptanal).The oviposition index or push-pull effect had no relevance to the mating rate as well as the deposited eggs per female,but the mating rate and the eggs laid per fe-male will change with the changing concentration.