Latest Roundup of Common Corn Pests and Diseases and Their Control Methods
Corn is a common crop and also the main source of income for many farmers, and pests and diseases are one of the major causes affecting corn yield. Below, QinNongNet brings you the common pests and diseases of corn, along with their characteristics and control methods. Let's take a look together.
1. Northern and Southern Leaf Blight
Northern leaf blight mainly harms the leaves, and in severe cases can also affect the husks. In the early stage of the disease, small grayish-green spots appear, which then gradually spread until the entire leaf is covered with large irregular spots bearing black mold-like growth. Southern leaf blight harms leaves and stems; when the disease occurs, oval or rectangular spots appear. Diluted Amisida can be sprayed to prevent and eradicate it.
2. Bacterial Wilt
Bacterial wilt is extremely harmful to corn. It mostly occurs during the jointing stage of corn and is not easy to detect. It causes the entire plant to wilt and die green. When the stem is peeled open, the pith inside is found to have turned brown. Because it is not easily noticed, it can be prevented by drenching the roots with specialized chemicals.
3. Rust Disease
Rust disease mainly harms the leaves. In the early stage of the disease, round spots appear on the leaves, accompanied by rust-colored powder. Later, spores grow on the spots. These spores can safely overwinter and will be spread again by airflow the following year, gradually expanding, causing great harm. When selecting seeds, choose hybrid varieties with strong disease resistance, fertilize reasonably, and in the early stage of the disease spray diluted wettable powder Triadimefon; when the disease is severe, spray repeatedly.
4. Hispa
The hispa has a hard shell and mostly lurks in the leaves, eating the leaf mesophyll clean and causing the leaves to wither and die. When hispa numbers are high, they can cause large areas of leaves to wither and die. Chemical control can be combined with manual control. For chemical control, try to choose pollution-free pesticides for spraying and killing, and cut off and burn the leaves damaged by hispa.
5. Stem Borers
Stem borers, also called heartworms, are the main insect pest of corn. They often bore into the stems and leaves of corn to feed, destroying the stem and leaf tissues so that nutrients cannot be transported, affecting corn growth and, in severe cases, killing the entire plant. Use specialized insecticides to drench the whorl or spray to kill the insects.
The above are the common corn pests and diseases and their control methods brought to you by QinNongNet. There are many more corn pests and diseases; this article only presents a few of the more common ones, and we hope it helps you.