Management measures of full Fruit period of Peanut for controlling Diseases and insect pests by fertilization

1. Foliar spraying fertilizer. After the peanut entered the full fruit stage, the root system aging, the absorption capacity decreased, and the nitrogen fixation and nitrogen supply capacity of root nodules weakened, resulting in early defoliation. In the later stage of peanut, foliar absorption capacity is enhanced, timely foliar fertilizer spraying can effectively supplement nutrients and postpone defoliation, which has many advantages, such as rapid action, high absorption and utilization rate, low investment, great benefit and so on. The kind of spraying fertilizer is easy to choose foliar fertilizer which contains more phosphorus and calcium.

Late management of peanut

2. For the fields that have not been sprayed with regulators or have not been sprayed with regulators before, it is necessary to spray 800 / 1200 times liquid "Zhuangyuan" (be careful not to spray on the ground), which can obviously thicken the leaves of peanuts, thicken the color of leaves, delay the time of falling leaves, accelerate the expansion and enrichment of peanut pods, enhance drought resistance and waterlogging tolerance, and slow down the premature senescence caused by spraying paclobutrazol and regulators containing this component.

3. Spraying fungicides. Leaf spot, especially net spot and brown spot, is one of the main causes of early defoliation of peanut, once it occurs, it spreads rapidly, often a large number of leaves fall off within a few days, resulting in a reduction in yield. Combined with foliar fertilizer spraying, the addition of broad-spectrum fungicides such as "mancozeb" or "methyl topiramate" can greatly reduce the harm and delay defoliation. The effect of carbendazim and fungicides mainly composed of carbendazim is not good.

4. Spraying insecticide. In the later stage, the main pests harming peanut leaves are leaf-eating pests such as Helicoverpa armigera, bridge insects and leaf mites (red spider). The former is easy to occur under the condition of high temperature, rain and humidity, while the latter occurs under dry climate. Insecticide and acaricides are sprayed at the young stage and when the spot occurs. On the basis of previous control of grubs, golden needles, ants and other underground pests, if there are still larvae or victims in the soil layer, sprinkle the quick-killing soil insect fertilizer powder or fill the pier with methyl isothiophos.

5. Drainage and waterlogging prevention. There are more Rain Water in the later stage, stagnant water in the ground and too much diving in the soil plough layer, which is also one of the reasons for early defoliation of peanuts, and serious ones may also cause rotten fruit, so it is necessary to rule out stagnant water in the field and diving in the plough layer in time. In addition, when most of the leaves fall off, the top leaves and stem branches turn yellow, and most of the pods are full. If the harvest is late, more fruit will be lost, the yield will be reduced, and the quality will become worse.