Common pests of white clover and their control methods

Common pests of white clover: leafhoppers

Pest symptoms

The larvae and adults mainly live on the back of leaves and suck the leaf juice. In mild cases, the leaves turn green and small white spots appear on the leaves. In severe cases, the leaves turn pale and their ornamental value is greatly reduced.

Prevention and treatment methods

Check in late April. If larvae are found, spray with 1500 times diluted 50% carbofuran or 2000 times diluted pyrethroid pesticide. The spray should be evenly distributed on the leaves, back of leaves, and inside and outside of the plant.

Common pests of white clover: white butterfly

Pest symptoms

One of the major pests of white clover. From April to October every year, white cabbage butterfly larvae often damage the leaves. The disease is most serious in the dry, hot and rainy summer season, when the larvae can eat all the leaves. The growth potential of affected plants is weakened.

Prevention and treatment methods

During the larval stage, you can spray green worm fungus to kill them. You can also sprinkle 2.5% dichlorvos powder in the morning before the dew dries.

Common pests of white clover: cutworms

Pest symptoms

In early spring, the damage to roots and buds is particularly severe in sandy soil. Some of the damage is done by biting off the rhizomes on the ground, while others eat the sprouts from underground, causing the death of large numbers of plants.

Prevention and treatment methods

In addition to the commonly used venom trapping, furadan granules can be applied in ditches or holes, with a dosage of 1500-2000 grams per mu. This drug has a long residual effect and can prevent harm 7-8 weeks after application.

Common diseases of white clover: Spodoptera litura

Pest symptoms

One of the main pests of white clover. They hide during the day and are active at night. At 1-2 years old, they feed on leaf flesh. At 3-4 years old, they nibble away at the leaf edges, leaving notches. At 5-6 years old, they reach the gluttonous stage, nibbling away at the leaves and even eating them completely. This insect has the property of feigning death, and its larvae have the habit of burrowing in the soil (1-2 cm). Rainfall is beneficial to it, while heavy rain or the invasion of cold air is not favorable to it.

Prevention and treatment methods

The most suitable growth temperature for Spodoptera litura is 15-25℃. Pesticides can be sprayed in the evening or morning. 2.5% trichlorfon powder and 5% carbofuran powder can be used at 22.5-30kg/hectare. You can also use 90% trichlorfon crystals 1000-1500 times diluted, 50% dichlorvos emulsion 1000-2000 times diluted, 50% carbofuran emulsion 1000 times diluted 50-100kg/mu for spraying.