As the temperature gradually drops and foggy weather becomes more frequent, sharp pepper disease has become increasingly common in greenhouses. Recently, many vegetable growers have reported various issues while cultivating hot peppers. The following are some of the problems that have been observed over time, compiled for reference by farmers:
A farmer from Wutai, Shouguang City, called to ask about shriveled peppers, wondering if it was a viral infection. The symptoms described included dry shrinkage in the center of the peppers, which could be an indicator of a virus. When infected, peppers may show mosaic leaves, fern-like leaves, bright veins, stunting, yellowing, necrosis, or top drying. Among these, the fern leaf virus is known to cause heart shrinkage. Infected plants often exhibit overall stunting, increased branching, and distorted leaves. If the symptoms match, it's likely a viral infection.
To control this, several options are available: spray 120% Virus A wettable powder diluted 500 times, 2 Virus Net or Virus Spirit at 500 times, 1.5% Phytopathogenic Ling emulsion at 1000 times, or Anti-toxic Agent No. 1 at 400 times. Apply once every 10 days for three consecutive sprays.
Another possible cause is aphid damage. Aphids can lead to curled, thickened, and brittle leaves with a shiny back. Under magnification, aphids can be clearly seen. For infestations, use agents like Deltamethrin, Avermectin, or Efford 1.
In addition, Mr. Liu Mingjie, a senior expert from the Vegetable Society of Shouguang City, pointed out that chemical phytotoxicity can also cause similar symptoms. There are two types: hormonal toxicity from improper hormone use and direct toxicity from high concentration sprays. Symptoms include twisted veins, thick and stiff leaves, darkening, and rolled edges. These signs often appear near the growing point and fruit area. To avoid such issues, hormone use should be strictly controlled. If necessary, use hormone-free products like Harvest No. 800.
Direct phytotoxicity can occur when using certain fungicides like Metalaxyl-MnZn or Mancozeb. Overuse can harm young leaves, leading to shrinkage. If phytotoxicity occurs, spraying 800 times Harvest No. 1 or using other protective agents can help reduce damage.
There was also a case of round pepper spot virus (also known as yellow shooter) in bell peppers. The affected fruits showed brown stripes without changes in the flesh. Experts confirmed it as a viral infection, and prevention is key. Viruses spread through insect wounds or mechanical friction.
Prevention measures include removing and destroying infected plants, controlling pests with Imidacloprid or other insecticides, setting up insect nets at vents, and foliar spraying with Harvest 800 mixed with 0.1% zinc sulfate. Regular spraying can help prevent infections.
Lastly, some farmers have reported that their pepper seedlings are not growing well. This issue is often due to poor nursery conditions. While the initial temperature is controlled, after emergence, temperatures drop, especially if insulation is inadequate. Farmers are advised to improve insulation by covering with straw or small sheds and regularly spray 800 times Harvest No. 1 to enhance cold resistance and promote strong seedling growth.
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