Corn blight – control and protection

Corn blight is an economically significant pest in the corn crop. It does the most damage in the crops of seed corn and sweet corn, but it also causes damage to vegetables and fruits. The pennant also attacks sorghum, hops, sunflower, tomato, and boxwood from ornamental plants, but it causes the greatest damage to corn and peppers.

In favorable conditions, corn borer has from one to three generations per year. The flight of butterflies of the first generation of corn borer begins at the end of May, although their release is not determined by a date, but depends on temperature factors. The butterfly does not damage the plant, but its larva, ie caterpillar.

The appearance of the corn borer butterfly can be followed by placing pheromone traps and examining the plants, where we can determine the presence of the corn borer and whether it has laid eggs on the back of the leaf. The eggs are irregularly round, whitish in color, complex like fish scales, in which the color changes before sawing into black. So, the damage is done by a larva that burrows into corn stalks, cobs or paprika fruits.

In addition to reducing productivity and the impact on fertilization, the presence of this pest causes the plant to break, and larval damage is an open entry for pathogens and the development of mycoses. Corn blight affects the reduction of corn yield by 2 to 25%.

Corn flamingo control

It is important to assess well whether and when to control corn blight. There are harmful thresholds that for sugar corn and seed corn amount to 5% of laid egg litters or damaged plants, and for mercantile corn it is 10% of laid egg litters. The time of protection varies from year to year, depending on the temperature and the development of the insect. For the first generation of this insect, the best time for treatment would be the beginning and middle of June, and for the second generation at the beginning of August.

Prerequisite for reducing the number and overwintering of this pest is plowing crop residues, deep plowing and weed control. Chemical control of corn borer on seed corn and sweet corn is a regular agro-technical measure, and it is increasingly on mercantile as well. The beginning of larval sawing is the phase when the application of insecticides against corn borer is recommended.

Agrosava recommends a combination of two insecticides to control corn borer: Alverde 240SC 0.25 l / ha i Fastac 10 EC 0.25 l / ha. Repeat the treatment for 10-14 days with a combination of recommended insecticides or a preparation Ampligo in the amount of 0.2-0.25 l / ha.

Author:

Elena Benjik

Master of Agriculture

Expert advisor for farming

Agrosava


Source: Bolja Zemlja by www.boljazemlja.com.

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