The corn borer leaves are short, and the insects are reduced. What should I do?

Recently, the growers reacted to corn with short leaves, and some of the plots were only one-third or half the length of the ears. In another case, different plots are planted in the same variety, some plots are normal, and some plots are short-leaved. Because the leaves are short, the grains are exposed to the outside, affecting the filling, resulting in reduced production; in addition, the short leaves are easy to attract insects, which will also reduce production.

main reason:

Short corn borer refers to the phenomenon that the top of the corn ear is not strong and the grain is not full, which seriously affects the corn yield. The main reasons for the short leaves are as follows:

First, lack of nutrition:

Phosphorus deficiency in the soil affects cell division. Especially in the filament elongation period, the phosphorus deficiency filaments are elongated slowly and affect pollination. If the grain at the top of the ear is small and is abnormally white, it will be deficient in phosphorus and potassium.

The second is the spikelet degradation:

Spikelets at the top of the ear, degenerative malformations, sometimes male or female flowers or male flowers develop and female flowers do not develop. Affect the normal pollination of corn.

Third, the filaments develop late:

The filaments at the top of the ear are developed late, and the silking is delayed. It is often not matched with the pollination of the male flowers, so that it cannot be firm.

The fourth is drought and water shortage:

Maize encountered drought during flowering pollination, and the flowering interval between male and female flowers was prolonged, which led to the missed tassel loose powder during the extension of the filament, resulting in poor pollination.

The fifth is excessive planting:

Excessive planting density causes poor ventilation and poor light transmission conditions in the late growth stage of corn, which affects the normal growth of corn.

Sixth, the soil lacks micro-fertilizer:

Boron deficiency in soil has an adverse effect on the formation of pollen and pollination activity of maize male flowers. When zinc deficiency occurs, the leaves of the old seedlings appear white spots, and rapidly expand, forming local white areas and necrotic spots, shortening between nodes, and easily causing abnormal growth of the ear.

Knowing these reasons, how to prevent the short-term occurrence of corn borer is the key!

1. Strengthen fertilizer and water management:

First, apply ear fertilizer early, apply panicle fertilizer before and after tasseling

The second is to prevent drought, and the water should not be dehydrated when the ears are out of the ear to ensure the normal growth of the leaves.

2, pay attention to the variety selection:

The red shaft variety of corn is poor in temperature resistance (the most sensitive in the US system, and the Asian-European system is relatively much better). In the case of high temperature, it often appears that "the ears and the leaves are not covered", and even the severe "grain" and severe "bald" Phenomenon, production reduction.

It is reported that corn white plus red (white axis plus red axis) mixed broadcast matching technology has achieved good results. Enhance the hybrid gene and re-hybridize on the basis of hybridization. "Double hybridization" has stronger resistance to stress. The white axis plus the red axis 2:2 mixed broadcast is beneficial to increase the 1000-grain weight, and the yield increase is obvious.

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