Abstract
In order to improve the cost-effective control of occurrence and damage of rice brown planthopper, Study of super indica japonica hybrid rice Yongyou 6 of brown planthopper population reproduction rate density effect. The reproductive rate and variation dynamics of rice brown planthopper in super rice was also investigated and analyzed. Field test results showed that the population amount of rice brown planthopper in super rice during tillering stage and booting stage gradually increased with the increasing amount of released pest and its growth amount gradually increased with the advancement of growth stage. However, as the density reached a certain limit during gain filling stage (>250 head/cluster), the population amount during maturity stage showed decline trend with the increasing density.
Highlights
Brown planthopper (Nilapavata lugens (Stal)) is migratory pest with high virulence in high yield cultivation of super rice
Much earlier sowing period and elongated growth period, as well as obvious earlier immigration period, obvious increase immigration peak and significantly elongated major period of Brown Planthopper (BPH) make the disaster frequency of the pest in super rice significantly increase and rice brown planthopper has become the major obstacle for the current ultra-high yield cultivation of super rice (Chen, 2007; Li et al, 2007)
To establish and improve monitoring and early warning system of rice brown planthopper and to improve the sustained control ability of the pest to achieve cost-effective ecological control of occurrence and damage of rice brown planthopper in super rice, the author carried out study on reproductive rate of rice brown planthopper population in super rice Yongyou 6 and its change dynamics and the results were shown as follows
Summary
Brown planthopper (Nilapavata lugens (Stal)) is migratory pest with high virulence in high yield cultivation of super rice. Much earlier sowing period and elongated growth period, as well as obvious earlier immigration period, obvious increase immigration peak and significantly elongated major period of Brown Planthopper (BPH) make the disaster frequency of the pest in super rice significantly increase and rice brown planthopper has become the major obstacle for the current ultra-high yield cultivation of super rice (Chen, 2007; Li et al, 2007). To establish and improve monitoring and early warning system of rice brown planthopper and to improve the sustained control ability of the pest to achieve cost-effective ecological control of occurrence and damage of rice brown planthopper in super rice, the author carried out study on reproductive rate of rice brown planthopper population in super rice Yongyou 6 and its change dynamics and the results were shown as follows
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