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Predicting the appropriate three-phase method for controlling corn borer
First, hand kneading method when the corn tassels began to enter the horn tube, hand squeezing the base of the horn can feel the front of the ear, but can not see from the horn inside the lead, that is, the end of the heart, generally From the tasseling 5 to 7 days. 2. Peel-off method When the corn will enter the stage of snoring, sample representative corn-leaf clumps will be selected, and the leaves that have turned green will be stripped, and the remaining yellow-white leaves will be developed leaf by leaf, if two to three pieces are developed. Exposing the tassel is the end of the heart; if only 4 to 6 leaves are opened, the tassel is seen, which is the middle period of the heart. Third, the number of leaf method according to the number of leaves at the end of the corn leaf is about equal to the total number of leaves of the plant of the variety minus 2 to determine, this method is simple, easy to grasp. Generally in corn in the end of the middle or late leaf stage for the prevention of corn borer appropriate period.