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
为掌握海南琼海地区菠萝凋萎病(Mealybug Wilt Disease of Pineapple,MWP)发生概况的基础数据,基于2018年以来琼海菠萝主产乡镇MWP田间显症率数据,从菠萝生育期、果园土壤类型和季节3方面分析了MWP田间发生特点。结果显示,MWP总体显症率...为掌握海南琼海地区菠萝凋萎病(Mealybug Wilt Disease of Pineapple,MWP)发生概况的基础数据,基于2018年以来琼海菠萝主产乡镇MWP田间显症率数据,从菠萝生育期、果园土壤类型和季节3方面分析了MWP田间发生特点。结果显示,MWP总体显症率约30%;全生育期MWP显症率呈现先高后低再渐升的趋势,即育苗期>大果期>小果期>花期>催花期>返青期>速生期;从果园土壤类型来看,MWP显症率沙土>砂壤土>壤土;从季节上看,MWP显症率呈夏季<秋季<冬春季的特点,水肥管理水平较高的果园显症率较管理不到位的低,且存在带毒种苗在产区间调运传播可能。琼海地区MWP发生程度是种苗、生育期、土壤、季节和管理等因子综合作用的结果,而非单一因子决定,鉴于此提出相关防控措施建议。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.
文摘为掌握海南琼海地区菠萝凋萎病(Mealybug Wilt Disease of Pineapple,MWP)发生概况的基础数据,基于2018年以来琼海菠萝主产乡镇MWP田间显症率数据,从菠萝生育期、果园土壤类型和季节3方面分析了MWP田间发生特点。结果显示,MWP总体显症率约30%;全生育期MWP显症率呈现先高后低再渐升的趋势,即育苗期>大果期>小果期>花期>催花期>返青期>速生期;从果园土壤类型来看,MWP显症率沙土>砂壤土>壤土;从季节上看,MWP显症率呈夏季<秋季<冬春季的特点,水肥管理水平较高的果园显症率较管理不到位的低,且存在带毒种苗在产区间调运传播可能。琼海地区MWP发生程度是种苗、生育期、土壤、季节和管理等因子综合作用的结果,而非单一因子决定,鉴于此提出相关防控措施建议。
