Lawn underground pest - how to control grubs efficiently?

Grub is one of the four major pests under the lawn, according to its feeding habits can be divided into three categories: plant feeding, dung feeding, and saprophytic eating. Among them, the plant-eating grub has a wide range of feeding habits, endangers a variety of garden vegetation, prefers to eat freshly sown seeds, roots, tubers and seedlings, affects the growth of lawn, causes lawn baldness, and reduces the ornamental value of lawn. The following Xiaobian will give a detailed introduction to the life habits of grubs and their prevention and control methods, hoping to bring help to everyone.

Morphological characteristics

The body of the grub is hypertrophied and curved nearly c-shaped, and the body is mostly white, and some are yellowish-white. The body wall is softer and wrinkled. Fine hairs on the surface of the body. The head is large and round, mostly yellow-brown, or reddish-brown, with left-right symmetrical bristles, often characteristic of the species. There are 3 pairs of pectoral feet, generally longer hind feet. There are 10 segments of the abdomen, the 10th segment is called the gluteal segment, on which there are spiny hairs.

Habits of life

The annual algebra of grubs varies from species to species and place to place. This is a type of insect with a long life history, generally one generation per year, or 2-3 years and one generation, and the elderly 5-6 years and 1 generation. For example, the great black gill golden turtle has two generations in two years, the dark gill golden turtle and the patina golden turtle have one generation per year, the small cloud-spotted gill golden turtle has 4 years and 1 generation in Qinghai, and the large chestnut gill golden turtle needs 5-6 years and 1 generation in the Ganzi area of Sichuan. Grubs are 3 years old. The 1st and 2nd age period is shorter, and the 3rd age is the longest. Grubs live in the soil for life, and their activities are mainly related to the physical and chemical characteristics and temperature and humidity of the soil. The average soil temperature of the most suitable activity in a year is 13-18 °C, higher than 23 °C, that is, gradually transferred to the deep soil layer, and then moved to the upper layer of the soil when the soil temperature drops to its suitable range of activities in autumn. Therefore, the damage of grubs to orchard nurseries, seedlings and other crops is mainly the heaviest in spring and autumn.

Prevention and control methods

1. Chemical control

Chemical control is currently the main method for controlling grub pests. 2-3 days after the lawn grass is mowed, the net particles of ground insects can be selected for spray control.

2. Agricultural prevention and control

(1) When planting grass in the construction of greening projects, pay attention to the problem of sand content to create an environment that is not conducive to the growth of grubs. For the plots that have been seriously damaged for many years, it is also recommended to change the soil, uncover the turf and shovel the soil 15-20 cm thick, replace it with 15-20 cm thick clay, and create an environment that is not conducive to the growth of grubs is the most important part of the future prevention and control.

(2) Use some suitable roadsides and wastelands to plant castor beans and poison their adult insects.

(3) Using the adult insect pseudo-death, artificially shaking the tree to make the adult insect fall to the ground to kill it.

3. Physical control And use the phototropism of adult insects to trap adult insects with black light lamps or black and green single tube double light during their peak period.