How to control the main "three diseases and four insects" of asparagus

Asparagus is a vegetable with high incidence of diseases and insect pests, mainly with "three diseases and four insects". The so-called "three diseases" refer to brown spot, stem blight and anthrax; the so-called "four insects" refer to night moth pests, aphids, thrips and mole crickets. So how to prevent and cure these "three diseases and four insects"?

Brown spot asparagus

Brown spot of "three diseases"

The disease mainly harms the stems, branches and leaves of asparagus, but mainly damages the branchlets and leaves of asparagus. Serious illness often causes asparagus to dry up and die early.

Prevention and control measures: use 75% chlorothalonil and 50% carbendazim, spray the above agents into 500 and 800 times respectively, spray once every 10 days, and spray every 7 days or so during the peak period of the disease.

Stem blight asparagus

Stem blight of "three diseases"

The disease mainly occurs in the stems, lateral branches or leaves of asparagus. The fusiform or short linear lesion is surrounded by a hydrophilic edge, showing edema.

Prevention and control measures: the principle of giving priority to prevention and comprehensive prevention should be adhered to. Select suitable planting land; thoroughly clear the garden, timely cut off diseased and dead plants; timely pruning and branching; pay attention to drought and drainage; rational fertilization; do a good job in field management.

Chemical control: when the new asparagus mother stem grows to 15 cm, 50% carbendazim is smeared with carbendazim. After the mother stem branching occurs, alternate use of 32.5% asparagus Qing 2 600 times solution, 50% isobarbazide 1000 times 1500 times solution, 0% methyl topiramine 700 times solution spray once after 7-10 days.

Anthracnose asparagus

Anthrax of "three diseases"

It mainly harms the stem, gray to light brown spots, fusiform or irregular, and small black spots grow in the disease part of asparagus in the later stage.

Control methods: bury or burn the diseased and residual asparagus in time during the harvest; pay attention to the drainage of the planting land after rain during the disease period, strictly prevent flood irrigation, and watering asparagus should be arranged in the morning to reduce night dew At the initial stage of the disease, spraying 500 times of 70% mancozeb wettable powder and 600 times of 75% chlorothalonil wettable powder can be sprayed once every 5-7 days, continuous prevention and treatment for 2-3 times, and drug withdrawal 7 days before harvest.

"four insects" night moth pests

Control methods: the adults of night moth pests can be killed by black light or sweet and sour liquid; when the first instar larvae are not dispersed or hidden in the soil, the drug resistance of adult night moth pests is very strong, and it is often difficult to kill. Generally, according to the prediction, the effect of spraying 4-5 days after the spawning peak is the best. The effect of spraying in the evening is better than that in the daytime, and the optional agents are: spraying 1000 times of trichlorfon crystal, spraying 40% Lesbon 1000 times, or 5% Yitaibao 1000 times.

Aphids and thrips of the "four insects"

Control methods: clean the countryside, weed frequently and irrigate in time; the control can be sprayed with 2000 times of Jule mixture, 1000 times of 50% dichlorvos and 1500 times of 10% imidacloprid.

Mole cricket of the "four worms":

Use 90% trichlorfon 30 times liquid to add water to stir, mix tide for degree, apply 1.2-2.5 kg per mu, the best spreading time is the windless and muggy evening. Use 1 kg of 3% phoxim granules and 3 kg of fine sand to spread in the seedling bed of asparagus.