一、为什么提出“两查两定” 准确地划分防治对象田、掌握防治适期和用药次数,是贯彻治螟巧、准、狠、省的关键。 过去划分防治对象田,只是在虫情发生期内,按禾苗的生育情况来排队。如防治白穗时,把孕穗末期至向未齐穗的水稻都划为防治对象田,这样往往 First, why the proposed “two checks and two determinations” accurately classifying the target areas for prevention and treatment as well as controlling the number of times for proper treatment and medication is the key to carrying out the management of the disease, precision, relentlessness and province. In the past, the field of prevention and control of objects was divided, only in the period of occurrence of the insects, they were lined up according to the fertility of the grasses. Such as the prevention and treatment of white spike, the end of booting to non-heading paddy rice are classified as control field, so often