The main chemical compounds in pyrethrum flower extract obtained by supercritical fluid extraction(SFE)were identified by GC-MS.Peak area normalization was
Four Chinese cabbage varieties of different resistances to black spot were studied.Chemical compositions of leaf surface rinses from four Chinese cabbage va
Some chemical compounds in petroleum ether extract of Mikania micrantha H.B.K.can strongly influence seedling growth of Phaseolus radiaus.In this study,we p
Flies are major pests not only causing economic damages on US livestock animal production,and also transmitting various diseases to human and animals.Annual