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RESISTANCE AND RESISTANT LEVEL OF PHYTOPHTHORA INFESTANS TO METALAXYL IN CHONGQING

Chao Bi

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Abstract

The causal agent of Late Blight of Potato(Phytophthora infestans)was isolated from potato leaves collected from Beibei, Yunyang, Kaixian,Wanzhou,Wuxi and Zhongxian in 2001. Total 94 isolates were obtained and tested for fungicide resistance and resistant level to metalaxyl by measuring the growth of the fungal colony. Results showed that 20 2% isolstes are resistant,11 7%isolates are intermediate in resistance and 68 1%isolates are sensitive to metalaxyl. The resistant levels of the two tested resistant isolates are much higher than that of the metalaxyl -sensitive isolate(PBB-1102).The resistant occurrence of isolates from different places is closely interrelated to the use of metalaxyl in these areas. The strategy for applying pesticide was put forward in connection with these areas.

About this research paper

What this paper is about

The causal agent of Late Blight of Potato(Phytophthora infestans)was isolated from potato leaves collected from Beibei, Yunyang, Kaixian,Wanzhou,Wuxi and Zhongxian in 2001. Total 94 isolates were obtained and tested for fungicide resistance and resistant level to metalaxyl by measuring the growth of the fungal colony. Results showed that 20 2% isolstes are resistant,11 7%isolates are intermediate in resistance and 68 1%isolates are sensitive to metalaxyl. The resistant levels of the two tested resistant isolates are much higher than that of the metalaxyl -sensitive isolate(PBB-1102).The resistant occurrence of isolates from different places is closely interrelated to the use of metalaxyl in these areas. The strategy for applying pesticide was put forward in connection with these areas.

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Available abstract

The causal agent of Late Blight of Potato(Phytophthora infestans)was isolated from potato leaves collected from Beibei, Yunyang, Kaixian,Wanzhou,Wuxi and Zhongxian in 2001. Total 94 isolates were obtained and tested for fungicide resistance and resistant level to metalaxyl by measuring the growth of the fungal colony. Results showed that 20 2% isolstes are resistant,11 7%isolates are intermediate in resistance and 68 1%isolates are sensitive to metalaxyl. The resistant levels of the two tested resistant isolates are much higher than that of the metalaxyl -sensitive isolate(PBB-1102).The resistant occurrence of isolates from different places is closely interrelated to the use of metalaxyl in these areas. The strategy for applying pesticide was put forward in connection with these areas.

Key concepts: Metalaxyl, Phytophthora infestans, Fungicide, Blight, Biology, Resistance (ecology), Horticulture, Pesticide

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