How to prevent and control leaf miners on peas in spring? What will happen if leaf miners appear on pea leaves?

The spring is the time when leaf miners are most likely to infest peas and broad beans, especially between spring and summer, when the disease is most severe. The temperature has risen, and it will be the peak period for leaf miners in peas and broad beans in a while, so you must pay attention. Let's take a look at how to prevent and control it!

How to prevent and control leaf miners in spring peas

Specific measures and methods for the prevention and control of pea and bean leaf miners should be mainly based on drug control, which is quick and effective. Choose sunny weather and spray 1000 times diluted 10% imidacloprid wettable powder for prevention and control, or 1500 times diluted 50% phoxim emulsifiable concentrate or 3000 times diluted abamyl emulsifiable concentrate for prevention and control.

Of course, pyrethroid insecticides can also be used for prevention and control, and farmers can choose according to local actual conditions.

Wearing a mask is a must during spraying operations. One reason is the need for the current epidemic, and the other is to prevent pesticide poisoning. Both must be taken into account at the same time. Spraying operations should evenly wet the upper and lower leaf surfaces of the entire pea or broad bean plant. Spray again about seven days after the first spraying. Spray three times in a row to achieve the effect of preventing and controlling leaf miners.

What happens if pea leaves have leaf miners?

The pea and broad bean leaf miners use their larvae to burrow beneath the epidermis of pea or broad bean leaves, zigzagging forward and feeding on green tissue, leaving irregular gray linear tunnels in the leaves.

When the damage is serious, the leaves are almost completely damaged and covered with boreholes. The leaves at the base of the bean grass are particularly seriously damaged, and in severe cases, they may wither and die.

The larvae not only feed on bean leaves, but also on the young pods and peduncles of peas and broad beans. The adults can also suck the juice of peas and broad beans, leaving small white spots where they have sucked.

The pea and broad bean leaf miner is a common pest. Due to the different temperatures in different places, it can have 3 to 18 generations each year. The higher the temperature, the more generations it has. In cold areas, leaf miners overwinter as pupae in the leaf knots of crops such as peas and silkworms. They can continue to reproduce in the warm winter in the south.

What are the dangers of leaf miners?

Although leaf miners are small, they can cause widespread damage, including peas and broad beans, as well as crops from the Cruciferae, Asteraceae, Apiaceae, Chenopodiaceae, and Polygonaceae families, such as Chinese cabbage, Chinese cabbage, rapeseed, kale, cabbage, chrysanthemum, celery, beets, spinach, and many other crops.

Leaf miners can also harm food crops such as rice, wheat, barley, and oats. Even lawns and other grasses are the food targets of leaf miners.

Pea leaf miners prefer to lay eggs in pea and broad bean plants that are dense and tall, and the areas most severely affected are also those where the plants grow densely and vigorously.

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Pea leaf miners are tolerant to low temperatures but afraid of high temperatures. If the temperature exceeds 35 degrees, the leaf miners can survive or overwinter as pupae. Therefore, the most serious damage is usually in late spring and early summer.

Temperature directly affects the development of leaf miners. Larvae and pupae can develop at relatively low temperatures. Temperatures of 16 to 18 degrees are most suitable for adult development, and temperatures of 20 to 22 degrees are most suitable for larval development.

The oval pupa is about 5mm long, changing from light yellowish brown to square reddish brown, and then to dark brown before it begins to emerge.