Mainly include: hand pinch method, stripping method, number leaf method, hand pinching method. When the corn tassel has just begun to enter the horn, the base of the horn can be felt by hand, but the front end of the scorpion can be felt, but from the horn When you can't see the male, it is the end of the heart, usually 5 to 7 days away.
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Second, the stripping method When the corn will enter the snoring period, sample the representative corn leaf plexus, peel off the green leaves, and expand the remaining yellow and white leaves leaf by leaf, such as after 2 to 3 pieces The tassel is exposed, which is the end of the heart leaf; if the 4 to 6 leaves are unfolded, the tassel is seen, which is the middle of the heart.
Third, the number and leaf method is determined according to the number of leaves in the late stage of corn heart is about equal to the total number of leaves of this plant, minus 2, this method is simple and easy to master. Generally, corn is in the late or middle stage of heart, and it is suitable for controlling corn borer.
