This year, many areas where grain and cotton are used as crops, due to the sluggish income from planting cotton last year, many cotton fields have been replanted with rice, and some have been replanted with lotus roots, especially in townships with good water sources near suburban areas. The field of cotton was changed to lotus root. For example, in Changxingpu Village, Qidong Farm, Hanchuan City, Hubei Province, there are more than 1200 acres of original cotton fields. This year, 600 acres of cotton fields have been changed to lotus roots, and the area of ​​cotton pods has been changed to more than 1,000 acres.
Although many of the farmers who grow oysters are contracted by large Anhui ancestors, they are also very concerned about the damage caused by maggots and Spodoptera litura. Because of the damage of these two pests, it will affect both the yield and the quality.
The lotus root is the golden worm, which mainly harms roots and lotus roots. Spodoptera litura mainly damages leaves, flowers and young lotus roots. Earthworms occur about once every year between April and April, and larvae are harmed by soil from July to August. Spodoptera litura breeds for several generations from July to August, and quickly forms a peak of damage.
The adults of the mantle are green-brown metallic beetles with a body length of about 6 mm. They often aggregate 20-30 grains into pieces when laying eggs, and the eggs are covered with white transparent colloidal substances. The larvae are 9-11 mm long, white, and the chest and abdomen are hypertrophied. Because they resemble cocoons, they are called mantles. The symptoms of the lotus root damage caused by the earthworms are black roots, black spots on the victim's body, yellow lotus leaf, and slow growth and development. Spodoptera litura is a multi-generation larvae that harms lotus roots. In severe cases, it can eat the leaves of lotus roots.
For the prevention and control of the mantle, in addition to the agricultural measures such as the practice of paddy-upland rotation and the removal of weeds, the chemical control should be carried out in sections. The first is to exclude the Mingshui water from Putian in the lotus root before budding, available terrin granules 0.4-1 kilograms per mu, or 40% quick-acting flow of phosphorus EC 70 ml per mu, or 50% phoxim granules or 3 The % carbofuran granules are 2.5-3 kg per mu and are mixed with 30 kg of fine soil. They are spread on the soil surface of the fields and then turned into the soil with the gums. All localities can choose to use medicine according to local conditions. Second, when lotus roots are planted, 50 kg of lime per acre is applied. The third is the beginning of adulthood, with 90% crystals of 100-150 grams of crystal trichlorfon per acre, mixed with fine soil in the early morning.
For the prevention and control of Spodoptera litura, the first is to use the larval clustering to pick eggs and capture larvae when the larvae are newly hatched, which can effectively control the expansion and damage. Second, in the larvae's initiating period, chemical control can be used, with 50% phoxim emulsion 500 times, or 80% dichlorvos emulsion 800-1000 times, or 2.5% kungfu emulsifiable concentrate 4000 times, the difference between the choice of spray. At the same time, it is also possible to use 2.5% A-dimensional saline dispersible granules, spray 10 grams per mu for 15 kg of water, or use 1% methylamino avermectin benzoate, spray 10 kg/mu for 15 kg water. , Or use 5% A-dimensional saline to disperse granules 5 grams per acre, spray 15 kg of water. The above agents should be applied before the third instar larvae in order to obtain the best results.
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