Control methods of alternanthera philoxeroides

Alternanthera philoxeroides, also known as water spinach, hollow amaranth, revolutionary grass, water peanut, etc., are perennial herbs of the genus Amaranthaceae, native to Brazil. They were introduced in Beijing, Jiangsu, Zhejiang, Jiangxi, Hunan, Fujian and later became wild. As a harmful invasive species, they are listed as the first batch of alien invasive species in China. Let's take a look at the control methods of alternanthera philoxeroides.

Hazard characteristics

The harm of alternanthera philoxeroides is mainly manifested in blocking waterways and affecting water traffic. Crowd out other plants to simplify the species of the community. Cover the water surface, affecting the growth and fishing of fish. Crops are harmed and yields are damaged in the farmland. There is a large number of propagation in field ditches, which affects farmland drainage and irrigation. Invade wetlands, lawns and destroy the landscape. Breeding mosquitoes and flies, endangering human health.

Agricultural measures

At ordinary times, it is necessary to strengthen field management, not rough farming, intensive cultivation, repeated and meticulous pulling out and cleaning of alternanthera philoxeroides seedlings, digging up the residual stems and nodes in the soil, and concentrated drying and burning. In areas where alternanthera philoxeroides have not been found, precautions should be strengthened to prevent asexual reproduction from invading pastoral, grassland or water areas. In areas where it has occurred, measures should be taken to control its spread.

Biological control

When the minimum temperature in early spring rises to more than 10 ℃, the adult of lotus grass straight-breast jumper beetle is released, and 1000-3000 adults per hectare are released, which can control its damage and spread. However, it is effective to control aquatic type plants with lotus grass straight breast leaping beetle, a specialized natural enemy originally from South America, but not for land type.

Physical prevention and cure

When uprooting and salvaging alternanthera philoxeroides manually and mechanically, the alternanthera philoxeroides should be dug or salvaged as deep as possible. The alternanthera philoxeroides can be centrally burned or fully ripe and retted into green manure. In addition, in the case of unsatisfactory chemical control effect, we can first salvage and remove part of alternanthera philoxeroides, depress the population density of alternanthera philoxeroides, and then spray pesticides.

Chemical control

1. Make it long: it is a kind of herbicide to control broad-leaf weeds, which not only has a killing effect on the root system of alternanthera philoxeroides, but also has a fast speed of uprooting some stems and leaves on alternanthera philoxeroides, so as to achieve a long-term effect of grass control. To control alternanthera philoxeroides on the ridge of the paddy field, 20% can be used to spray its EC 1000 times at the base leaf, and adding a small amount of detergent in the EC can improve the control effect by about 20%. When used in farmland, if the broad-leaved crop has germinated and unearthed, it should not be used to make it grow, otherwise it will cause drug damage.

2. Nongda water agent: 4 Nongda water agent can prevent alternanthera philoxeroides on the edge of rivers, ponds and ditches, using the application method of high concentration and low water volume, spraying with 41% Nongda water agent 100 times liquid, so that the solution is attached to the stems and leaves of alternanthera philoxeroides, and the Nongda water agent entering the water will not cause water pollution and is non-toxic to fish, shrimp and so on. Serious harm to fish ponds, should be divided into areas to prevent a large number of alternanthera philoxeroides death and decay, resulting in anoxia in fish ponds.