Corn yield reduction weather

(1) Maize belongs to wind-borne flowers, and cross-pollinated plants are easily restricted by external environmental factors. For example, if there is no wind or rainy weather during pollination, the pollination ability will be greatly reduced, thus reducing the chance of fertilization and affecting the yield of fruits and seeds. The ear of maize is often short of grains, which is mainly caused by insufficient pollination. In order to make up for the lack of pollination in the natural state, if supplementary or auxiliary pollination).

(2) The locomotion organs of locusts are feet and wings, and the wings expand the locomotion range of locusts. Before the third instar, fleas only have wings and buds, with small range of activities and dense distribution, which is convenient for pesticide application.

So the answer is: (1) Rain will knock off the pollen in stamen anthers, which will reduce the amount of pollen, leading to a decrease in pollination rate and corn yield.

(2) It is better before the 3rd instar, because at this time, locusts have no wings, a small range of activities, a high distribution density and are easy to be killed.