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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2013年50 No.3

The occurrence law of Laodelphax striatellus in single rice-wheat rotation area
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Key Words:small brown planthopper; host transfer; overwinter; wheat interplanting with rice; rice stripe virus disease; rice black-streaked dwarf disease; control strategy
Abstract:Seasonal population dynamics and among-host transmission patterns of the small brown planthopper (SBPH) in rice-wheat rotation fields were investigated using light traps, yellow pan water traps, tray flaps and tray scraps. Our results showed that SBPH overwintered mainly on senescent gramineous grasses and/or other dense-growth plants in conventional cropping system wheat fields while mainly on paddy stubble in the rice-wheat intercropping system. On average, 50-60% of SBPH population can successfully overwintered . In the rice-wheat intercropping system without tillage, the rate of transmitting SBPH from rice to wheat was about 10% and was about 20 times higher than with tillage . The number of SBPH successfully overwintered in the rice-wheat intercropping system with no-tillage was 35 and 77 times higher that with shallow tillage and conventional tillage, respectively. Massive migration in SBPH populations occurred only once a year, peaking at the time when wheat is harvested) and migrating into rice seedling beds nearby. The population of adult SBPH decreased sharply after transplanting and its occurrence in the paddy field were mainly emerged from unhatched eggs carried by the rice seedlings. These results indicate that rice-wheat intercropping creat a favorable environment for the overwinter of SBPH and could be the main factor contributing the severe outbreaks of SBPH and rice stripe virus disease in recent years. Therefore, we propose the use of rice-wheat intercropping system with a shallow tillage to control SBPH-transmitted rice virus diseases such as rice stripe virus disease and rice black-streaked dwarf virus disease etc.
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