Research on toxicity of two populations of planthopper (Nilaparvata lunges stal) in Ha Noi y Tien Giang
2005
Nguyen Van Dinh | Tran Thi Lien
Two brown plant hopper (BPH) populations (Nilaparvata lugens Stal) Hanoi and Tiengiang were reared on susceptive rice varieties Khangdan and Nep for development and the experiments were conducted in the laboratory conditions at temperature 260C and 16 h light. The results showed that ratio of short wing adults and weight of the two populations is not different when they fed of susceptive TN 1, but when they fed on resistant variety CR 203, the ratio of short wing/long wing and their weight of Tiengiang population is significantly higher than that of Hanoi population. The life cycle of Tiengiang population is shorter than that of Hanoi population. Moreover, the number of off-spring in 2 days of Tiengiang population is 20 percent higher than of Hanoi population. The data showed that the virulence of these two populations is different and the virulence of Tiengiang BPH population is more serious. Among 5 rice standard resistant varieties tested, only Rathu heenati (Bph3) and Babawe (Bph 4) are resistant to Hanoi BPH population, meanwhile only Rathu heenati (Bph3) is resistant to the Tiengiang BPH population. All varieties having Biotype 5 and Biotype 2 are susceptive to both two populations. So it is needed to implement a strict country quarantine to keep BPH of Tiengiang from expending to other regions
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