What about corn hummers? Occurrence Regularity and Control Countermeasures of Corn Thrips
Spring corn has gradually been planted, gradually revealing the ground into the seedling stage. The management of seedling corn may cause pests and diseases. Among them, Hummer is one of them. How do we control corn thrips? Let's take a look at the occurrence rules and control measures of corn thrips.
First, the occurrence and characteristics of corn thrips
1. Typical characteristics of corn thrips: small size, often active in hidden parts, so it is difficult to be found. Adults or nymphs suck the young leaf juice in the corn heart and destroy the corn growth point. The damaged corn leaves are chlorotic, yellow, and even the heart leaves curl into a "oxtail" shape. And caused the internode shortening, which is known as the "corn screw core."
2. The occurrence of corn thrips: The main source of spring corn comes from wheat crops. It is usually first propagated on wheat crops and then gradually transferred to the corn. Generally, it is at the peak of nymphs at the end of May, enters the peak period of adults in mid-June, enters the peak period of second-generation nymphs in late June, and enters the peak period of second-generation adults in early July.
3. Hazard characteristics of corn thrips: The horses are happy with high temperature and dry conditions, so the dry and hot weather is one of the high-risk environments of Hummer. Secondly, the improper management of fertilizer and water, the corn field with poor ventilation environment is also the main hazard of Hummer. Rainfall has an inhibitory effect on the occurrence of thrips.
Second, the control measures of corn thrips
1. Maintain field hygiene: timely eradicate diseased leaves, diseased fruits, old leaves, diseased leaves, and concentrated destruction outside the park to reduce the spread of pathogens. At the same time, it is necessary to clean up the weeds in the field, which is beneficial to reduce the number of insects.
2. Strengthen the management of fertilizer and water: combine fertilization and irrigation, timely supplement the water with the weather conditions, and the leaf surface can be properly applied with calcium fertilizer to avoid calcium deficiency. However, avoid flooding with water, pay attention to "small water and water pouring" to regulate the correct humidity for suitable strawberry growth.
3. Adopt physical control: physical control is to use the color rendering of the thrips. Because the Hummer is more sensitive to blue, you can set the blue board for trapping. For corn seedlings that have formed a "bull tail", a portion can be removed from the top to promote normal growth of the heart leaf.
4. Use chemical control: Pay attention to the time to fight drugs, because the horses are squatting at night, so the leaves are sprayed before the sunrise in the morning, the control effect is better, or after sunset, but in the evening, it is easy to increase the humidity and cause other diseases. Dosing drugs to select several drugs for rotation, so as not to cause resistance. It can be controlled by 10% chlorfenapyr or 5% polychlortetracycline. Both of these drugs are both suspending or microemulsions and are very safe. 10% chlorfenapyr has strong penetrability in the leaf surface, has a certain systemic action and has the characteristics of wide insecticidal spectrum, high control effect, long-lasting effect and high safety. More than 5% of the caromycin is through the acute contact and stomach toxicity, can interfere with the insect central nervous system is normal, conduction causes the nerves to block, so that the pests are paralyzed and die.
All in all, no matter what disease, the main point of prevention and control is to pay attention to a word, that is, "early", only timely timely prevention and control measures can ensure the healthy growth of corn.
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