What are the factors related to the disease resistance of corn? When discussing this issue, we should consider the investigation from the emergence and maturity of corn, and evaluate it objectively and scientifically during the whole corn growth period. The identification of natural incidence in the field is related to climate, soil belt and other aspects.
1. Different diseases occur in different planting areas.
(1) Large spot disease: such as corn spot disease in Shanxi, the current Fufu District is a large spot disease recurrence area, the incidence of large spot disease is high, and in some years it can be reduced due to large spot disease. %-50%, but to Xiangyang and other places, the large spot disease is a light-haired area, which rarely occurs in general years. For example, Xianyu 335 is a well-recognized species that does not resist large spot disease, but it rarely occurs here. This means that the disease resistance of the evaluated variety depends on the region.
(2) Silk smut: The incidence of silk black ear in the northeastern spring maize area is higher, but the incidence of silk black ear in the summer area of ​​Huanghuaihai is relatively low.
(3) Rough disease: The Yuncheng area in Shanxi is still a recurrence area of ​​rough disease, and the incidence of general susceptible varieties in Yuncheng area is very high; Yangquan in Shanxi was also a recurrence area of ​​rough disease, near It has been relatively light in recent years; the Jiaodong Peninsula in Shandong is also a re-emergence area for rough disease. In other areas, the incidence of children will also occur, but the incidence is very low.
(4) Small spot disease: In general, the summer sowing area is more serious, but the spring sowing area is relatively lighter.
(5) Gray spot disease: It is generally more serious in the southwestern region, but it is also seen in Donghua North but will not have a big impact.
(6) Curvularia leaf spot: Under normal circumstances, the summer sowing area is serious, and the spring sowing area is relatively light.
2, different planting areas but may also be ill
(1) Black powder disease: the incidence of smut is not related to the region, but is related to drought. If there is a long-term drought in the spring sowing area, the incidence of smut is very high due to the alternating wet and dry after rain; In the summer sowing area, it is also easy to occur in the case of alternating wet and dry conditions.
(2) Bacterial wilt (stalk rot): It occurs in both spring and summer sowing areas, and is related to soil-borne bacteria and variety resistance.
(3) Ear rot: occurs in all areas, and is related to climate, soil permeability and variety resistance. When selecting a variety, attention should be paid to the resistance of the variety, but there are many types of pathogens causing ear rot, which should be selected in combination with the pathogenic bacteria.
Therefore, when promoting varieties, we must understand the disease resistance of the varieties, accurately position the varieties, and avoid disease recurrence areas.
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