What pesticide works well to control corn earworms?

The earworm is one of the more common pests of corn, and once the earworm gets inside the corn, it can no longer be controlled. So pest control must be taken seriously. So what pesticide should be sprayed for corn earworms?

1. What pesticide to spray for corn earworms

Once the earworm bores into the fruit, it cannot be controlled, so mastering the correct timing of control is the key to managing this type of pest. For the pear fruit moth, peach fruit moth, peach pyralid moth and others, sex pheromone lures can be hung in the orchard, and the number of trapped insects checked every day; generally 1 lure is enough for a 15-mu orchard. When the number of trapped adult moths rises sharply, check the egg-bearing fruit once every 3 days. When the rate of egg-bearing fruit reaches 1%, chemical control can be carried out. The main types of pesticide are pyrethroid pesticides, such as 20% fenvalerate, 2.5% deltamethrin, 10% cypermethrin, 20% fenpropathrin, 2.5% lambda-cyhalothrin or 21% fenvalerate-phoxim at 2500-3000 times dilution. If spider mites occur at the same time, fenpropathrin and lambda-cyhalothrin can be applied to control both.

2. Biological control

In nature there are many beneficial insects that keep pests in check, mainly:

1. Predatory natural enemies. Such as lacewings, ladybugs, flower bugs, spiders, ground beetles, ants and others can all prey on the above pests.

2. Parasitic natural enemies. Such as Trichogramma wasps, which can parasitize the eggs of many insects, ichneumon wasps, which parasitize the pear fruit borer, and braconid wasps, which parasitize the peach fruit moth, etc. For the picked fruit infested with the pear fruit borer, cut them open and inspect them. If there are many parasitic wasps, the infested fruit should be kept, covered with a gauze cover, and released after the natural enemies emerge, so that they continue to destroy the pests.

3. Protective measures. When natural enemies are abundant, do not apply broad-spectrum pesticides; use other control methods as much as possible, or avoid applying pesticides during the emergence period of natural enemies, so as to give play to the role of natural enemies in controlling pests.

3. Physical control

Set up black light lamps. Many pests are phototactic, and setting up black light lamps in the orchard can trap and kill many kinds of pests, such as the pear fruit moth, peach pyralid moth, cotton bollworm and others.

2. Sugar-vinegar liquid trapping. Use 1 part sugar, 4 parts vinegar, 16 parts water, plus a small amount of trichlorfon, to make a sugar-vinegar liquid, put it in a bowl, hang it on the tree, trap the adult insects to feed, and kill them, such as the pear fruit moth, peach pyralid moth, cotton bollworm and others. Rotten fruit can also be placed in a vat to make fruit vinegar for use.

3. During the occurrence period of the cotton bollworm, insert branches of poplar, willow and tree of heaven around the orchard, several branches to a bundle; the adult cotton bollworms bore into the bundles, and are caught and killed in the early morning.

Corn earworms must be controlled early, and attention must be paid to the timing of control, so as not to miss the best period and cause a reduction in yield.