Occurrence and Control of Diseases and Insects in Arid Wheat Field in Spring

Due to the lack of rain and snow in the winter and spring, some of the wheat fields are seriously affected by drought, and the normal overwintering of wheat has been affected to varying degrees. At the same time, it also provides appropriate sites for over-wintering of some diseases, weeds and weeds. Therefore, farmers should be reminded to pay attention in the spring. Occurrence and control of some diseases and pests, so as to avoid loss of wheat production.

I. Occurrence characteristics of current crops and diseases in wheat fields

1. Wheat spiders: Dry years Wheat spiders are severe, and some yellow wheat fields have now suffered yellow leaves. The wheat spiders are divided into two types: wheat spiders and wheat leg spiders. Among them, wheat long-legged spiders are drought-loving pests and they use winters as adults and eggs in wheat fields. The overwintering adults began spawning in mid-February. Since the temperature rises quickly, it is conducive to overwintering and breeding of wheat spiders, resulting in accelerated field reproduction. At present, due to the long-term drought of wheat seedlings, the growth of wheat seedlings is weak. If the wheat spiders re-emerge seriously, yellow wheat leaves will be formed in the wheat field. Severely, the leaves will be whitened and the plants will die. This will cause severe reduction of wheat production.

2. Wheat field weeds: The winter drought is not conducive to the weeds overwintering, but most of the good wheat fields in general have no death. Such as the recent planning management, will cut off part of the interline weeds. However, the weeds unearthed in the ridge room and in the spring still need to be treated. The persistent drought caused a thickening of the weedy cuticle. The weeds are small, old, and hard, which is detrimental to chemical weed control.

3. Soil-borne diseases are mainly wheat full-bleeding disease, sheath blight, and root rot: As a result of drought, wheat seedlings grow slowly and disease resistance declines, and watering will accelerate the proliferation of pathogens when returning green.

Second, prevention and control strategy

1. Wheat spider investigation should be conducted in time: Due to the occurrence of a bit of a piece of wheat spiders, self-profiling should be performed. The survey focused on dryland wheat. It should be clear whether the wheat seedlings are yellow, yellow or yellow, or yellow leaves caused by wheat spiders. The symptoms of wheat spiders are: The leaves have white spots, heavy seedlings are not long, and the leaves are dry. Control methods: watering, can drown part of wheat spiders; spraying, can be used 1.8% avermectin EC 3000 times, mixed with 40% dimethoate EC 1000 times, between 10 and 15 o'clock medication, pay attention to spray Evenly spray thoroughly.

2. Weeding in wheat fields is considered for safety. Weeding methods are used for grass weeds. In the middle and late April weeds are removed immediately after heading. Broad-leaf weeds pay attention to the amount of liquid chemicals when weeding, and the amount of water must be enough, 45 mu of water per mu, spray carefully. Promote the use of 2,4D isooctyl esters to prevent broadleaf weeds.

3. Soil-borne diseases should pay attention to the observation of the seedlings when they turn green, especially the root rot of the wheat seedlings is slow to return to green, and it is too late to stand up. After returning to Qingshui, comprehensive measures to promote root protection and disease prevention should be taken in time. Among them, full-eclipse fields that do not use drugs in autumn are indispensable for medication. Formulation for prevention and treatment: 85% Trichloroisocyanuric acid soluble powder 1500 times liquid + 6000 times love overcharge + "green wind 95" 600 times liquid, or quinolone (carbenazole), carbendazim, rick show (E The oxazole alcohol) also added 6,000 times more than the "green wind 95" 600 times, spraying wheat seedlings, to ensure that the liquid penetrates into the rhizome. And after 7 days, use it again.