Blaptostethus pallescens Poppius (Heteroptera:Anthocoridae),which is amenable to mass rearing,has proved to be a potential predator of sucking pests like mites and thrips.Recently,the cotton mealybug Phenacoccus solen...Blaptostethus pallescens Poppius (Heteroptera:Anthocoridae),which is amenable to mass rearing,has proved to be a potential predator of sucking pests like mites and thrips.Recently,the cotton mealybug Phenacoccus solenopsis Tinsley emerged as a serious pest on cotton in India.Laboratory studies indicated that B.pallescens could feed on the cotton mealybug.Hence,further investigations were conducted to understand the stage of the predator which is most potential and the pest stage preferred by the predator.Mature nymphs and adults of B.pallescens could predate equally well on the neonates of cotton mealybug.Young (three to four-day-old) nymphs of the predator could not feed on any stage of the cotton mealybug.Mature nymphs (seven-day-old and above) and adults could effectively predate on both young and mature cotton mealybug crawlers,though preference was more for the younger crawlers.However,nymphs and adults of B.pallescens could not predate on the adult stage of the mealybug.Different predator:pest ratios were tested in cage studies and it emerged that B.pallescens adults released against the mealybug crawlers at a ratio of 1:5 and nymphal release at 1:10 caused maximum mortality of the mealybug crawlers.Considering the fast multiplication rate of cotton mealybug and the large number of predators which have to be released to manage them,further detailed studies are necessary on utilizing B.pallescens to target the neonates and younger stages of the cotton mealybug in field conditions.展开更多
研究了副珠蜡蚧阔柄跳小蜂Metaphycus parasaissetiae Zhang and Huang在室内温度为25℃条件下对寄主橡副珠蜡蚧parasaissetia nigra Nietner成虫不同发育阶段的选择性,结果表明:副珠蜡蚧阔柄跳小蜂喜欢产卵于褐色期至少量幼虫出壳期的...研究了副珠蜡蚧阔柄跳小蜂Metaphycus parasaissetiae Zhang and Huang在室内温度为25℃条件下对寄主橡副珠蜡蚧parasaissetia nigra Nietner成虫不同发育阶段的选择性,结果表明:副珠蜡蚧阔柄跳小蜂喜欢产卵于褐色期至少量幼虫出壳期的橡副珠蜡蚧成虫体内,只有在较高的接蜂比例条件下,初期成虫才能被寄生;单个寄主体内的产卵量以寄生产卵初期的成虫最高,寄生率和选择系数则均以褐色期成虫最高;副珠蜡蚧阔柄跳小蜂寄生于橡副珠蜡蚧的初期成虫至少量幼虫出壳成虫体内的发育历期差异不大,为16～17 d;出蜂数以产卵初期成虫最高,为112.6头,明显高于其它几阶段。结合发育历期、寄生率、出蜂数等参数,橡副珠蜡蚧成虫的产卵初期和少量幼虫出壳期成虫是副珠蜡蚧阔柄跳小蜂寄生的最佳时期。展开更多
基金financial support extended by the Cotton Mission Mode project TMC MM1 3. 3
文摘Blaptostethus pallescens Poppius (Heteroptera:Anthocoridae),which is amenable to mass rearing,has proved to be a potential predator of sucking pests like mites and thrips.Recently,the cotton mealybug Phenacoccus solenopsis Tinsley emerged as a serious pest on cotton in India.Laboratory studies indicated that B.pallescens could feed on the cotton mealybug.Hence,further investigations were conducted to understand the stage of the predator which is most potential and the pest stage preferred by the predator.Mature nymphs and adults of B.pallescens could predate equally well on the neonates of cotton mealybug.Young (three to four-day-old) nymphs of the predator could not feed on any stage of the cotton mealybug.Mature nymphs (seven-day-old and above) and adults could effectively predate on both young and mature cotton mealybug crawlers,though preference was more for the younger crawlers.However,nymphs and adults of B.pallescens could not predate on the adult stage of the mealybug.Different predator:pest ratios were tested in cage studies and it emerged that B.pallescens adults released against the mealybug crawlers at a ratio of 1:5 and nymphal release at 1:10 caused maximum mortality of the mealybug crawlers.Considering the fast multiplication rate of cotton mealybug and the large number of predators which have to be released to manage them,further detailed studies are necessary on utilizing B.pallescens to target the neonates and younger stages of the cotton mealybug in field conditions.
文摘研究了副珠蜡蚧阔柄跳小蜂Metaphycus parasaissetiae Zhang and Huang在室内温度为25℃条件下对寄主橡副珠蜡蚧parasaissetia nigra Nietner成虫不同发育阶段的选择性,结果表明:副珠蜡蚧阔柄跳小蜂喜欢产卵于褐色期至少量幼虫出壳期的橡副珠蜡蚧成虫体内,只有在较高的接蜂比例条件下,初期成虫才能被寄生;单个寄主体内的产卵量以寄生产卵初期的成虫最高,寄生率和选择系数则均以褐色期成虫最高;副珠蜡蚧阔柄跳小蜂寄生于橡副珠蜡蚧的初期成虫至少量幼虫出壳成虫体内的发育历期差异不大,为16～17 d;出蜂数以产卵初期成虫最高,为112.6头,明显高于其它几阶段。结合发育历期、寄生率、出蜂数等参数,橡副珠蜡蚧成虫的产卵初期和少量幼虫出壳期成虫是副珠蜡蚧阔柄跳小蜂寄生的最佳时期。
