Maize Genomics and Genetics 2025, Vol.16, No.3, 149-166 http://cropscipublisher.com/index.php/mgg 160 'Meiyu 25' is a sweet and glutinous corn variety bred by Hainan Lvchuan Seedling Co., Ltd. (National Approved Yu 20233432). The growth period of this variety is medium to late, and the full growth period of spring sowing is about 111 days. The fresh ear yield of 'Meiyu 25' is medium, with an annual yield of about 800 kg, and the yield level is relatively stable. As a glutinous variety, 'Meiyu 25' has outstanding flavor and taste advantages: its sweetness ranks among the best in glutinous corn, with good glutinousness (viscosity), sweetness in glutinousness, soft and fragrant taste, full and beautiful appearance of commercial ears, and a high score of 78 points in the sensory evaluation. In terms of field performance, 'Meiyu 25' plants grew well, with strong comprehensive resistance, and no serious pests and diseases were found. 'Meiyu 25' is a new variety of fresh corn that is both sweet and sticky. While meeting consumers' demand for the sweet and fragrant taste of glutinous corn, it has a certain yield guarantee and is suitable for promotion in the cultivation of glutinous corn in Linhai area. 5.3 Integration and effectiveness of green pest control technologies The demonstration area attaches great importance to the green control of pests and diseases throughout the production process of fresh corn, and strives to effectively control pests and diseases without or with less application of chemical pesticides. The main diseases of fresh corn in Linhai City include corn leaf spot, corn leaf spot, corn sheath blight and corn rough dwarf disease, and targeted green control plans have been formulated for each disease. Corn leaf spot usually occurs after corn tassels emerge. Plant resistance can be enhanced by selecting disease-resistant varieties and balanced fertilization, and low-toxic pesticides such as pyraclostrobin, difenoconazole or methyl thiophanate can be sprayed on the leaves at the early stage of the disease to curb the spread of the disease. Corn leaf spot is prone to epidemics in high temperature and high humidity environments. The key points of prevention and control are to plant disease-resistant and high-yield varieties, strengthen field management during the heading and flowering period, promptly remove diseased and damaged plants, and spray protective fungicides such as chlorothalonil or mancozeb once every 7 days. Spraying 2 to 3 times can effectively reduce its damage (Sudhakar et al., 2024). Corn sheath blight is a common soil-borne disease in corn production. It often begins to infect and harm corn from the jointing to the large trumpet stage. It is advisable to apply appropriate pesticides (such as oxamycin and tebuconazole, etc.) from the jointing to the tasseling stage for prevention and control to inhibit its spread during the silking and filling period (Ferrero et al., 2023). Corn dwarf disease is a viral disease transmitted by the gray leafhopper. There is no specific drug for treatment at present. Prevention is the only option: choose disease-resistant varieties, remove weeds around corn fields to reduce virus vectors, reasonably adjust the sowing period to avoid the peak of gray leafhoppers, and use seed coating (such as seed dressing with prochloraz or imidacloprid) to reduce the infection rate in the seedling stage. Through the above measures, the incidence of the above diseases in the demonstration area has been significantly reduced, and there has been no large-scale epidemic. In terms of pest control, the demonstration area is mainly threatened by two major pests: corn borer and corn armyworm. Corn borer is one of the most common major pests on corn. Its larvae can eat the tassels, leaves and stems of corn. In severe cases, it will lead to a significant reduction in corn yield or even the whole plant lodging. For corn borer, the demonstration area emphasizes a comprehensive prevention and control strategy with prevention as the main focus: timely clean up the corn stalks in the field after the winter harvest to eliminate the overwintering insect source; in April and May of the following year, when the corn borer larvae hatch and have not yet drilled into the stems, use low-toxic and high-efficiency pesticides for prevention and control. For example, spread trichlorfon granules on the heart leaves, or mix phoxim with fine sand and spread evenly on the heart leaves, and spray appropriate amounts of high-efficiency low-residue insecticides such as emamectin benzoate when necessary; at the same time, combine biological control measures such as releasing the natural enemy of corn borer, trichogrammatid wasps, spraying Bacillus thuringiensis preparations, and minimize the population base of corn borer larvae. In recent years, the occurrence of corn armyworm has become increasingly serious in the local area, with the harmful characteristics of collective overeating. It often breaks out quickly in high humidity and hot weather: the larvae can eat up the entire corn leaf within a few days, posing a major threat to corn production safety. The demonstration area adopts the strategy of "trapping and killing adults+timely treatment of larvae" for green prevention and control of armyworms: on the one hand, insect traps or sweet and sour liquid are set up in the field to trap and kill adults, straw is inserted to attract armyworm adults to lay eggs
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