[Objective] Camellia oleifera Abel is a typical woody oil plant in China and it has many functional components. Since it was first found in 1980, Basilepta melanopus Lefevre has become the pest with outbreak area, whi...[Objective] Camellia oleifera Abel is a typical woody oil plant in China and it has many functional components. Since it was first found in 1980, Basilepta melanopus Lefevre has become the pest with outbreak area, which makes the yield and quality of camellia seed oil suffer great losses. The aim was to provide refer- ences for the field damages and prediction of Basilepta melanopus Lefevre based on severity of damage and the actual need for prediction of B. melanopus. [Meth- ods] The investigation was carried out to study the average number of wormholes in damaged leaves, average number of fruit per branch and leaf damage rate caused by B. melanopus using point-survey systematically at Yong＇an Town of Changsha, Hunan Province from early May to middle June in 2014. Six functions were used to find the optimal model through fitting to calculate the threshold of mean wormhole number. [Results] The cubic equations had the best effects in fitting the 3 pairs of variables of average wormhole number and camellia fruit, camellia fruit and leaf damage rate, and wormhole number and leaf damage rate, and the variance analy- sis reached the extreme significant difference （P〈0.05）. [Conclusion] Based on these mathematical models, the threshold of wormhole number is 5.01 per leaf.展开更多
To find the method for the integrated control of Tetranychus cinnabarinus （carmine spider mite） and delay its resistance to pesticides, the joint actions of each of five commonly pesticides （abamectin, azadirachtin...To find the method for the integrated control of Tetranychus cinnabarinus （carmine spider mite） and delay its resistance to pesticides, the joint actions of each of five commonly pesticides （abamectin, azadirachtin, matrine, pyrethrins and imidacloprid）, and Neoseiulus cucumeris （Oudemans）, the natural enemy of cotton red spider mite, were studied. N. cucumeris was released after application of pesticides for seven days （for 0,3% azadirachtin EC） or six days （for other pesticides）. The results showed that the combined action of 1.8% abamectin EW （1：8 000） and N. cucumeris had the best control efficacy of 96.63% at 20 days after N. cucumeris releasing. The control efficacies of N. cucumeds and 0.3% azadirachtin EC （1：250） were 59.7% and 90.1% after one day and 20 days, respectively, after N. cucumeris releasing. The control efficacy of N. cucumeris and 0.5% matrine AS （1：2 000） was 82.65% at 20 days after N. cucumeris releasing. The results provide options for sustainable control of T. cinnabarinus and for the delay of pesticides resistance.展开更多
文摘[Objective] Camellia oleifera Abel is a typical woody oil plant in China and it has many functional components. Since it was first found in 1980, Basilepta melanopus Lefevre has become the pest with outbreak area, which makes the yield and quality of camellia seed oil suffer great losses. The aim was to provide refer- ences for the field damages and prediction of Basilepta melanopus Lefevre based on severity of damage and the actual need for prediction of B. melanopus. [Meth- ods] The investigation was carried out to study the average number of wormholes in damaged leaves, average number of fruit per branch and leaf damage rate caused by B. melanopus using point-survey systematically at Yong＇an Town of Changsha, Hunan Province from early May to middle June in 2014. Six functions were used to find the optimal model through fitting to calculate the threshold of mean wormhole number. [Results] The cubic equations had the best effects in fitting the 3 pairs of variables of average wormhole number and camellia fruit, camellia fruit and leaf damage rate, and wormhole number and leaf damage rate, and the variance analy- sis reached the extreme significant difference （P〈0.05）. [Conclusion] Based on these mathematical models, the threshold of wormhole number is 5.01 per leaf.
基金Supported by the Modern Agricultural Technology System of Hunan Province(Xiangnongyelian No.[2012]278)the Project of the Department of Science and Technology of Hunan Province(2010NK3011,2011FJ4298)~~
文摘To find the method for the integrated control of Tetranychus cinnabarinus （carmine spider mite） and delay its resistance to pesticides, the joint actions of each of five commonly pesticides （abamectin, azadirachtin, matrine, pyrethrins and imidacloprid）, and Neoseiulus cucumeris （Oudemans）, the natural enemy of cotton red spider mite, were studied. N. cucumeris was released after application of pesticides for seven days （for 0,3% azadirachtin EC） or six days （for other pesticides）. The results showed that the combined action of 1.8% abamectin EW （1：8 000） and N. cucumeris had the best control efficacy of 96.63% at 20 days after N. cucumeris releasing. The control efficacies of N. cucumeds and 0.3% azadirachtin EC （1：250） were 59.7% and 90.1% after one day and 20 days, respectively, after N. cucumeris releasing. The control efficacy of N. cucumeris and 0.5% matrine AS （1：2 000） was 82.65% at 20 days after N. cucumeris releasing. The results provide options for sustainable control of T. cinnabarinus and for the delay of pesticides resistance.
