Recently, when the author was investigating cotton production in the countryside, he saw that the transplanted cotton seedlings for nutrition seedlings had generally four true leaves, and earlier seedlings with better management had five to six true leaves, and the leaf area. Larger and stronger. However, some farmers reported that some field cotton seedlings were transplanted and planted to survive. Holes appeared in the cotton leaves, and some of the leaves were eaten. Some of the cotton seedlings were cut off, and some of the young stems of cotton plants were broken. Three to five consecutive young shoots of cotton seedlings were snapped, resulting in lack of seedlings and ridges. I do not know what the insects were.

cause

In the evening, the author came to Daejeon, where the farmer's cotton seedlings were seriously damaged. He used a shovel to plow the soil around the victim's cotton seedlings and saw that the ground tiger was hiding in the soil. It was the current culprit of cotton seedlings.

Ground tigers, called silkworms in some places, occur 4 to 6 generations a year when the climate is suitable. Each female moth can lay eggs of 800 to 1,000 grains and reproduce rapidly. From the start of cotton seedling and sowing in mid-April, whether it is the nursery bed of cotton seedlings or the live field of Daejeon, it may be harmed to varying degrees, and it continues until the budding of cotton. After the damage of cotton seedlings, the loss of plant damage directly affects the density of the cotton field, which reduces the number of peaches in the cotton plant and will inevitably lead to a decline in yield.

Responses

To this end, it is imperative that various measures be taken to make up for the losses and to strengthen prevention.

First, prepare for cotton seedlings. In the survey, the author found that some experienced farmers still left some cotton seedlings after the transplanting of cotton seedlings. They should be transplanted immediately to make up for the shortages. As long as the management is strengthened, it is entirely possible to promote balanced growth.

Second, do a good job of agricultural control. It is mainly used to eradicate the weeds in and around the cotton field to reduce their parasitic breeding sites. Wherever possible, sweet and sour liquids can be used to trap adult tigers in the field.

Third, carry out chemical prevention. Farmers with adequate labor force can harvest about 100 kilograms of fresh grass and mix 1 kilogram of 90% crystal trichlorfon with fresh water and place it in the cotton field in the evening, which can lure the tiger larvae. In the field of chemical control, one can use lambda-cyhalothrin 5 g / l water emulsion, 20-25 ml per acre, spraying 40 kilograms of water; two can be sprayed with 5% phoxim EC 1000 times; three available 90% trichlorfon crystals were sprayed 1000 times; four were sprayed with 40% chlorpyrifos emulsifiable concentrate or 48% chlorpheniramine emulsifiable concentrate plus 20% thiocarbamate cream each 1500 times.

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