A new dihydrochromone derivative, named chaenomone, was isolated from the twigs of Chaenomeles sinensis (Thouin) Koehne. The structure was determined by spectroscopic methods.
Chaenomeles sinensis spot leaf cast is one of the most serious diseases in production. The biological characteristics of Marssonina coronaria were studied and the suitable pesticides against the pathogen were screened...Chaenomeles sinensis spot leaf cast is one of the most serious diseases in production. The biological characteristics of Marssonina coronaria were studied and the suitable pesticides against the pathogen were screened in the paper, to provide a scientific basis for studies on epidemic regularity and control of the disease. The effects of different nutrition and environmental conditions as well as nine pesticides on the mycelial growth of M. coronaria were investigated in this paper. The results indicated that the mycelium grew well on the PDA medium with pH of 7.0, and soluble starch and urea were suitable carbon and nitrogen sources, respec- tively. The lethal temperature was 45 ~C, and the light-dark alternation （12/12h） was benefit for mycelial growth. Among the nine tested pesticides, carbendazim was the most effective agent, with ECs0 of 8.78 mg/L, and its relative inhibition rate was 85 % under the recommended concentration of 1.0 mg/L. Mancozeb was the least effective agent, and its relative inhibition rate was only 40.8% under the recommended concentration of 1.67 mg/L.展开更多
文摘A new dihydrochromone derivative, named chaenomone, was isolated from the twigs of Chaenomeles sinensis (Thouin) Koehne. The structure was determined by spectroscopic methods.
基金Supported by National Natural Science Foundation of China(31200488)Applied Basic Research Project of Yunnan Province(2011FB066)Open Fund of Key Laboratory for Quality Control of Characteristic Fruits and Vegetables of Hubei Province(2014K05)
文摘Chaenomeles sinensis spot leaf cast is one of the most serious diseases in production. The biological characteristics of Marssonina coronaria were studied and the suitable pesticides against the pathogen were screened in the paper, to provide a scientific basis for studies on epidemic regularity and control of the disease. The effects of different nutrition and environmental conditions as well as nine pesticides on the mycelial growth of M. coronaria were investigated in this paper. The results indicated that the mycelium grew well on the PDA medium with pH of 7.0, and soluble starch and urea were suitable carbon and nitrogen sources, respec- tively. The lethal temperature was 45 ~C, and the light-dark alternation （12/12h） was benefit for mycelial growth. Among the nine tested pesticides, carbendazim was the most effective agent, with ECs0 of 8.78 mg/L, and its relative inhibition rate was 85 % under the recommended concentration of 1.0 mg/L. Mancozeb was the least effective agent, and its relative inhibition rate was only 40.8% under the recommended concentration of 1.67 mg/L.
