Fumigation Efficacy of Ethyl Formate on Wheat, Corn and Rice in Sealed Desiccators
Ethyl formate(EF) is a potential alternative fumigant to methyl bromide and phosphine for the control of insect pests in stored commodities. Effects of temperature, relative humidity and grain m. C. On toxicity of EF were studied using sealed desiccators containing maize, wheat or rice. Lower temperatures decreased efficacy of EF. A concentration of 80 mg/L EF killed>98% of Sitophilus zea-ma/s Motschulsky placed on top of the grain exposed 72h at 16,24 or 32℃. However,very low mortali-ties of S. Zeamais placed under rice at all three temperatures and under wheat at 16℃. A concentration of 80 mg/L EF could not control Rhyzopertha dominica （F.) on top of wheat or rice and below all three grains at 16℃,72h exposure. Increased r. H. Increased efficacy of EF. At 35 and 65% r. H.,very low mortalities of S. Zeamais and R. Dorninica were found below maize after an applied concentration of 80 mg/L EF after 72h at 25℃. However,when r. H. Was increased to 95%,it killed>90% of both pests. The efficacy of EF was reduced at higher grain moisture contents. At>12% m.c.,mortality of S. Zeamais and R. Dominica under maize was below 20% even though higher r. H. Of 60 and 90% were used.
ethyl formate temperature r. h moisture content mortality fumigation
He Yanping Xu Li Chen Sisi Xu Guangwen Xie Lingde
College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, P.R.China
国际会议
成都
英文
165-169
2008-09-21（万方平台首次上网日期，不代表论文的发表时间）