Gardening Tips

Corn pests and diseases and their control

Corn pests and diseases and their control

Corn is a plant that has been cultivated for approximately 10,000 years by the indigenous peoples of central Mexico. It arrived in Europe in the 17th century and since then its cultivation and consumption have spread throughout the world.

So much so, that it is the cereal with the largest production volume in the world, ahead of such basic products as wheat and rice. Due to this enormous popularity, there are a large number of pests and diseases that have adapted to this plant. In this EcologíaVerde article we teach you what are the pests and diseases of corn and their controlas well as photos of each of them so you can identify them well.

gray worm

We begin this list of corn pests and diseases and their control with the gray worm. It is known by this name to butterfly larvae of different species. They have a size of about 5 cm and curl up on themselves in the face of danger. The fight against the gray worm is done with the application of insecticides. For control gray bollworm pestswe recommend the use of bacillus, which is an ecological type insecticide.

Corn pests and diseases and their control - Gray worm

corn drill

Is sesamia moth caterpillar it enters the stem of the plant and its ears, devouring them from the inside. In order to combat it, an insecticide such as bacillus must be used again, but it is necessary to apply it to the ears at the moment they are growing, since once they are adults the product will not penetrate and it will be too late.

Here you can learn more about How to prevent and eliminate caterpillars from plants naturally.

Corn pests and diseases and their control - Corn drill

Corn aphid, one of the most common pests

This insect is placed on the leaves and spikes of the plant, from which it sucks the nutrients it needs. If the number of aphids is very large, it can affect the production of the plant. The time when aphids attack the most is in the warm months. There are many ecological remedies to combat aphidsincluding garlic infusion, nettle slurry or potassium soap.

If you want to learn about more methods against this pest, we recommend this other post on the best home remedies to eliminate aphids on plants.

Corn pests and diseases and their control - Corn aphid, one of the most common pests

Red spider

The red spider mite is another of the most widespread pests in a large number of crops and ornamental plants. It is easy to identify due to its striking reddish color and the fabric that it builds on the underside of the leaves. For combat red spider mite in corn You can increase the humidity in the leaves or you can use sulfur, neem or neem oil, paraffin oil or the always useful potassium soap.

Corn pests and diseases and their control - Red Spider

mice and rats

We continue with this list of maize pests and diseases and their control focusing now on some small mammals: rats and field mice.

Depending on the location of the crop, these little rodents they may appear attracted to your corn plants. Resorting to specialized products is the most expensive and least ecological option, so we recommend that you use natural products such as spurge extract. The tender shoots of this plant, after macerating for a little over a week in water, produce a mixture whose bad smell will keep these animals away. In addition, noises and vibrations or mobile structures, such as grinders, help to scare them away.

Corn pests and diseases and their control - Mice and rats

corn rust

This is the most common disease in corn cropsspread over almost the entire world. It is shown in the leaves, which reveal yellow spots on both sides, and end up turning shades between red and black. Fight and control rust in maize, once it appears it is very difficult, so the affected plants are usually eliminated and measures are taken to prevent it from reaching the crop, such as the use of varieties resistant to it.

Corn pests and diseases and their control - Corn Rust

coal spike

It is a fungus that enters the plant and does its damage systemically. Unable to locate coal spike fungus until the plant grows and shows its spikes, which appear black and deformed, as in the image. This fungus in corn is combated with the application of fungicides, opting better for ecological fungicides.

Corn pests and diseases and their control - Coal spike


The rot can appear both in the stem and in the roots of the plant and, normally, it is due to bacterial agents that produce black areas in the affected parts. In addition, it usually appears when irrigation or humidity are excessive. These bacteria cause the reduction of the harvest and even the withering of the entire plant. The best for control rot is to carefully monitor the levels of humidity, both environmental and due to irrigation, and ensure good drainage of the land to avoid puddles of water.

Corn pests and diseases and their control - Rot

Mosaic virus, one of the most common corn diseases

causes the yellow leaves on the corn, leaving their nerves very visible and considerably reducing the growth and development of the plant. Since viruses cannot be treated once they have appeared, the only possible measure is to choose corn varieties resistant to these viruses and dispose of affected plants, always covering them in bags to prevent the spread of spores during transport.

Corn pests and diseases and their control - Mosaic virus, one of the most common corn diseases

fungus on corn

Apart from shank coal, there are many varieties of fungi that can attack corn. A very good ecological option to combat them is to use homemade fungicide made with milk. In the same way, crop rotation and the use of resistant varieties go a long way in keeping this threat at bay.

Here you can find information on How to make homemade fungicides for plants and crops.

Corn pests and diseases and their control - Fungi in corn

If you want to read more articles similar to Corn pests and diseases and their controlwe recommend that you enter our category .

About the author


Leave a Comment