tailieunhanh - Báo cáo: Kết quả nghiên các giải pháp phòng trừ rày nâu, bệnh vàng lùn và lùn xoắn lá hại lúa tại đồng bằng sông Cửu Long 2007 - 2009

Kết quả nghiên cứu các giải pháp phòng trừ rày nâu, bệnh vàng lùn và lùn xoắn lá hại lúa tại đồng bằng sông Cửu Long 2007 - 2009 nhằm trình bày kết quả nghiên cứu và xây dựng quy trình và các mô hình chống dịch tại những vùng sản xuất lúa trọng điểm bị hại nặng do rầy nâu. Mời bạn đọc cùng tham khảo. | Kết quả nghiên cứu khoa học cõng nghệ 2006 - 2010 KẾT QUẢ NGHIÊN cứu CÁC GIẢI PHÁP PHÒNG TRỪ RẦY NÂU BỆNH VÀNG LÙN VÀ LÙN XOẮN LÁ HẠI LÚA TẠI ĐÒNG BẰNG SÔNG cửu LONG 200 7 - 2009 Ngô Vĩnh Viễn1 Nguyễn Như Cưàmg1 Nguyễn Trường Thành1 và cs. SUMMARY Research results of Brown Planthopper and Rice virus management in the Mekong delta from 2007 to 2009 In 2006 Brown Planthopper BPH and virus diseases were outbreak on rice in 22 provinces in Southern Vietnam. BPH damaged 239 266 ha of rice and 174 283 ha by virus diseases Rice grassy stunt virus - RRSV and Rice ragged stunt virus - RRSV . However the BPH damaged and virus disease was were reduced in 2008 - 2009. To determine the present of RRSV and RGSV with plant and BPH samples were analysed by RT - PCR. The RRSV and RGSV is transmited by BPH in a persistence manner and incubation period in PBH body is from 7 to 13 days. There was no difference between egg and nymph of BPH on rice infected by virus and healthy rice but the adult stage of BPH rearing on rice infected by virus was about 5 days longer than BPH rearing on healthy rice. The highest number of BPH was collected by light trap concentrated from march to may and from august to december with a period form 7-13 days the interval of two peak was 25 - 30 days. Transmission rate of virus deases by BPH catched from light trap from 5 to 35 . There are 116 rice varieties from Hong river delta were screened with Long An s BPH in which 5 varieties are resistant. Whereas there are 120 of 149 rice varieties form Mekong delta are resistant with Ha Tay s BPH population. Chemical efficiency in controlling BPH vector of RGSV and RRSV Systemic chemical in protecting seedlings are Oshin 25 WP Chess Dantotsu 16WSG Actara 25WG Contact chemical Bassa 50EC Bassan 50EC and Chemical efficiency in protecting seedlings by seed treatment Cruiser Plus Gaucho 600FS. The method of control the RRSV and RGSV Appying simultaneously difference methods such as Cultivation BPH outbreak .