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RISS 인기검색어
- 검색키워드
- 저자 : Lai Rongquan (검색결과 2 건)
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Rongquan LAI,Chaozhi ZHU,Jingjing BAI,Xiaoting WU,Gang GU,Jianbao BAI,Ting ZHOU,Dingfeng WANG,Hanqing HU,Tianran LIN 한국곤충학회 2020 Entomological Research Vol.50 No.3
Although the densities of tobacco pests have been decreased in garlic-tobacco fields, further studies are needed to judge the effects of garlic transplanting densities or times on tobacco pests in tobacco fields. Therefore, field experiments were conducted in Liancheng County in Longyan City, Fujian Province, in China in 2014 and 2015. Myzus persicae (Sulzer) abundance, the species or abundance ratios of enemies and pests, the intercropping effects and the tobacco yield and crop value showed that the effects of transplanting tobacco 10 days after garlic transplantation at a density of 5.85 individual plants per square meter on pests were stronger than those of other treatments. Aphid abundance was significantly lower in transplanting tobacco 10 days after garlic transplantation at a density of 5.85 individual plants per square meter than in the other treatments. The ratio between enemies and pests in transplanting tobacco 10 days after garlic transplantation at a density of 5.85 individual plants per square meter was higher than those in the other treatments. The intercropping effects of transplanting tobacco 10 days after garlic transplantation at a density of 5.85 individual plants per square meter on Myzus persicae, Spodoptera litura (Fabricius), Heliothis assulta Guenee and Nezara viridula Linnaeus were significantly stronger than those of the other treatments, whereas the effects of transplanting tobacco 15 days after garlic transplantation at a garlic density of 5.85 individual plants per square meter on Agrotis ypsilon (Rottemberg) were significantly stronger. Additionally, the yield and crop value of transplanting tobacco 10 days after garlic was transplanted at a density of 5.85 individual plants m ̅2 were higher than those of the other treatments. Therefore, our study demonstrated that the model of transplanting tobacco 10 days after garlic was transplanted at a density of 5.85 individual plants m ̅2 is an optimal management strategy to control flue-cured tobacco pests and to acquire higher crop yield in garlic-tobacco fields.
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Juvenoids on aphids to prolong optimal stages
Lai Rongquan,Bai Jingjing,Gu Gang,Zhou Ting,Mi Yuee,Zhang Bang,Han Meng,Bai Jianbao 한국곤충학회 2021 Entomological Research Vol.51 No.3
In recent years, Aphidius gifuensis, a critical parasitoid, has been increasingly used to control Myzus persicae in tobacco. However, problems due to inconsistent emergence and insufficient numbers of A. gifuensis to control M. persicae have arisen in artificial reproduction. Here, we investigated the effects of the juvenoids ZR-512, ZR-777, ZR-515, fenoxycarb and juvenile hormone (JH) III on the performance of M. persicae, the activities of molting enzymes and parasitism rates. The aim was to identify juvenoids that may prolong the ‘arrived too early’ optimal stages of M. persicae for A. gifuensis parasitism to address the problems mentioned above. The results showed that the developmental durations of 2nd- and 3rd-instar nymphs of the parental (F0) and offspring (F1) generations of M. persicae were significantly prolonged by juvenoid treatment. The instar durations ranged from 4.00 to 13.67 h for the parental generation and from 8.00 to 32.00 h for the offspring. M. persicae lifespan was not significantly affected by the juvenoids, whereas fecundity was. Additionally, the phenoloxidase and chitinase contents and activities in M. persicae were significantly reduced by the juvenoids, whereas the parasitism rate of A. gifuensis on M. persicae was unaffected. Our study provides information that can help prolong the ‘arrived too early’ period of effective parasitism of M. persicae nymphs by A. gifuensis and thereby benefit the large-scale artificial reproduction of A. gifuensis. These findings will enhance the biological control of M. persicae and highlight the mechanism by which juvenoids affect M. persicae development by regulating phenoloxidase or chitinase.
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