Main Symptoms of Corn Dwarf Mosaic Virus (CDMV)
Corn Dwarf Mosaic Virus (CDMV) can infect corn plants at any stage of growth, but it is most likely to affect young plants from the seedling stage to pre-tasseling. Infected plants exhibit varying degrees of stunting, typically showing symptoms as early as the 3-leaf stage. Initially, small, elliptical, chlorotic spots appear between the veins at the base of the heart leaves. These spots develop into discontinuous streaks along the veins, gradually expanding into broader chlorotic stripes. Severely affected leaves may turn yellow, and the plants become brittle and prone to breakage. The leaves start to turn red and dry out from the edges towards the center, severely impacting the plant's photosynthesis. This leads to poor tassel formation, incomplete kernel development, reduced seed vigor, and lower seed yield and quality.
Key Points for Controlling Corn Dwarf Mosaic Virus
1. Agricultural Control Methods
(1) Selecting Resistant Varieties
Choosing resistant varieties is crucial for managing CDMV. Recommended resistant varieties include Denghai 618, Suyu No. 9, Xundan 20, and Weike 702. Using seeds from disease-free areas also helps in prevention.
(2) Timely Sowing
There is a close relationship between CDMV incidence and aphid populations, which transmit the virus. Therefore, it is essential to avoid peak aphid migration periods, typically in June and July, when planning the sowing schedule.
(3) Aphid Control
Timely spraying of insecticides is necessary during the initial and peak periods of aphid migration into corn fields. Commonly used insecticides include 50% pirimicarb wettable powder (3000 times dilution) and 10% imidacloprid wettable powder (2000 times dilution).
(4) Managing Infected Plants
Effective field management involves regular weeding and cultivation to reduce the source of infection. During the seedling stage, remove infected plants promptly. For fields with severe infections, consider replanting with other crops to mitigate economic losses.
2. Chemical Control Methods
In fields where CDMV is present, use antiviral agents such as moroxydine hydrochloride, 7.5% virazole, Virus A, or 83 booster agents. Apply these agents during the early stages of infection, spraying every 7 days for a total of three applications.
Conclusion
Overall, Corn Dwarf Mosaic Virus is a significant viral disease affecting corn yield. To prevent yield loss, it is crucial to focus on key control measures, especially timely aphid control. Implementing these practices promptly can help mitigate the impact of CDMV on corn production.
FAQs about Maize Dwarf Mosaic Virus (MDMV)
What are the symptoms of Maize Dwarf Mosaic Virus?
The symptoms of Maize Dwarf Mosaic Virus (MDMV) include stunting, yellowing of leaves, mosaic patterns on leaves (light and dark green areas), and in severe cases, plants may exhibit a bushy or rosette-like appearance.
What is the major symptom of mosaic disease?
The major symptom of mosaic disease, including MDMV, is the appearance of mosaic patterns on leaves, which are caused by a disruption in chlorophyll production due to the virus infection.
What are the symptoms of Corn Virus?
Corn Virus symptoms include stunted growth, yellowing and drying of leaves, and reduced tassel and ear development. Infected plants may also show mosaic patterns on leaves.
What are the symptoms of the Corn Abnormal Dwarf Mosaic Virus (CAMV) virus?
The symptoms of the Corn Abnormal Dwarf Mosaic Virus (CAMV) virus include stunting, mottling or mosaic patterns on leaves, and malformation of ears, which can result in reduced grain quality and yield.
