The common pests in bamboo shoot stage are Spodoptera exigua, bamboo spring fly, bamboo elephant and so on. These pests are bored and eat bamboo shoots, which leads to bamboo shoots shrinking or bamboo seedlings being deformed. We should implement the policy of "prevention is more important than treatment" and do a good job in prevention. The combination of cutting loose soil, clearing weeds and shrubs in the forest and improving the sanitary environment of bamboo forest has a good effect on eliminating the first-instar larvae of bamboo moth and preventing the overwintering bamboo moth from being unearthed. When bamboo shoots are unearthed, they are dried with 223,200 times of 25% emulsion. Spraying 1 time every 1 week after bamboo shoots are unearthed has control effect on all kinds of bamboo shoots. In the bamboo forest where bamboo shoot flies occur, dichlorvos smoke agent can be applied in the adult stage, and the adults can be smoked and killed per hectare 10kg. Using the suspended animation of bamboo shoot weevil, it can be killed artificially. In addition, bamboo shoots should be dug up in time to eliminate larvae.

Bamboo shoot pests and their control

The main pests that are harmful to bamboo shoots are: bamboo gall midge, bamboo gall midge, bamboo gall midge, bamboo gall midge, bamboo gall midge, bamboo gall midge, bamboo gall midge and so on.

1. Ordinary young woman

Bamboo shoot moth, also known as bamboo shoot moth and bamboo shoot moth, is one of the main pests in bamboo shoot stage. Bamboo shoots and moth larvae feed on economic bamboo shoots such as Phyllostachys pubescens, Phyllostachys pubescens, Phyllostachys praecox, Phyllostachys praecox and Phyllostachys pubescens. In serious areas, a large number of bamboo shoots die and cannot be made into bamboo. Even if they do, they will be beheaded.

The adults of Spodoptera exigua are grayish brown, with a body length of17 ―― 20mm, a wing spread of 38 ―― 43mm, a yellowish brown head and chest, and a dark brown neck plate and wing base. The abdomen is light brown-gray; The front wing is light brown, with 1 triangular brown spots at the base of the front wing and a funnel-shaped brown spot at the front edge of the tail region. The baseline is brown, and it passes through the brown spots. The inner layer is double-line brown, wavy, yellow and white in ring and kidney lines, white in the outer edge of kidney lines, brown in the middle line, thick and jagged. The back end is connected with the outside line, yellow and white, serrated. The tip of the tooth is brown and white, and the kidney line is between the outer lines. There are also several inconspicuous supporting toothed stripes on the wing surface. The hind wings are brown and the base is yellowish. Eggs are nearly round and about 0.5 mm long. Larvae * * * 5 years old, with red-orange head and purple-brown body. The older the larvae are, the darker the color is, the thinner the dorsal line is, the wider the subdorsal line is, and the first half of the fifth subdorsal line is missing. The mature larvae are 26 ~ 45 mm long. Pupa reddish brown, 20 mm long. Every year, 1 generation occurs, and eggs overwinter on gramineous weeds on the ground of bamboo forest. In late February of the following year, the overwintering eggs hatch into larvae, and the weeds of Gramineae and Cyperaceae are eaten first. When the bamboo shoots were unearthed in early April, the larvae climbed onto the bamboo shoots, ate the pointed leaflets of the bamboo shoots, and accumulated green debris outside their mouths. Three-year-old larvae eat the soft parts of bamboo shoots. After bamboo shoots are killed, the surface loses luster, and there are holes and insect droppings inside. Larvae live in bamboo shoots for 18 ~ 25 days. In early May, mature larvae come out of bamboo shoots and cocoon and pupate. The pupal stage is 20 ~ 30 days. It emerged as an adult in early June. Adults lay eggs on the leaves of gramineous weeds, and dozens of eggs are arranged in strips. Wrap eggs in leaves in winter. Weeds are first harmed in the middle and late February, and bamboo shoots are eaten in the first half of April. Larvae eat bamboo shoots, which defeats them.

Prevention and control methods:

(1) Strengthen tending, weeding and ridging to promote high yield of bamboo forest and eliminate overwintering eggs.

(2) Dig out the murdered bamboo shoots as soon as possible and kill the larvae in the bamboo shoots.

(3) After bamboo shoots are produced in timber bamboo forest, the 50% wettable powder of trichlorfon is diluted to 1000 times, or 200 times of 223 emulsion is sprayed on forest land for 2-3 times to kill insects and protect bamboo shoots.

2. Sugiyama Kumamoto

Spodoptera exigua mainly harms Phyllostachys pubescens, Phyllostachys pubescens, Phyllostachys pubescens and other bamboo shoots. Female adults are about 22 mm long and their wings are about 48 mm long. The male adult is about 65438 0.9 mm in length and 42 mm in wingspan. Antennas filiform, chest and back grayish brown, feet grayish brown. Eggs are beige when they are born, then light brown and oblate. The mature larva is about 35 mm long, with an orange head and a slightly blue-gray body. The pupa is about 17mm long and reddish brown. 1 year 1 generation, overwintering with eggs. Hatches in the first half of April of the following year. In may, the harm caused by eating human bamboo shoots is bamboo shoots 15 ~ 25 days, pupation in late may, eclosion in early June, and oviposition for wintering. Larvae live in bamboo shoots for 3 instars, each for 5-6 days, totaling 15-25 days. The mature larvae bite through the bamboo shoots, climb out and fall to the ground. The fallen leaves spun silk to form a thin cocoon, which pupated in the radius around the injured bamboo shoot 15 ~ 20 cm. If there are no fallen leaves, they will make cocoons in bamboo rafts or in shallow soil. The pupal stage is 15 ~ 20 days.

Control method: the same as that of bamboo shoots and moths.