Greenhouse tomato pest control measures

Recently, the temperature is getting colder every day, and the humidity inside the greenhouse is also getting bigger. The tomato pests and diseases that have come from it have become more powerful. At this time, the prevention and control of pests and diseases in tomato greenhouses is very important for planting tomatoes. Tomato pests and diseases mainly include bacterial spot disease, gray mold disease, and cotton blight. We can do a good job in the prevention and treatment of these diseases.

First, gray mold

Botrytis cinerea is prone to low temperature and high humidity environment. It is easy to occur when the temperature is about 20 degrees and the relative humidity is higher than 90%. The leaves, stems and fruits of tomatoes may be infected with gray mold. These affected sites produce sparse to dense gray or taupe mildew when the humidity is relatively high.

Control formula:

50% boscalyl (Kaiser) + 40% sclerotium net;

50% fluazinam + 70% propenium zinc (An Taisheng)

Second, cotton blight

The cotton blight mainly harms the fruit. Any part of the fruit can be infected. It begins with a smooth, light-colored, inhomogeneous or nearly circular lesion on the near-shoulder or fruit umbilical or fruit surface, and then rapidly spreads around, showing a dark brown Or shallow wheel pattern, after the diseased part spreads to most or the whole fruit surface, the flesh rots and browns until the diseased fruit falls off.

Control formula:

80% mancozeb + 68% refined metalaxyl · manganese zinc;

50% dimethomorph + 80% mancozeb

Third, bacterial spot disease

Bacterial spot disease we call it bacterial leaf spot, the most serious disease in the leaf margin and immature fruit. Bacterial plague is usually produced on the leaves, producing dark brown to black spots, and a yellow halo tends to appear around them. The young green fruit is infected with a dark brown small dot, which is scattered on the fruit surface, slightly higher than the peel, but the center is not sunken. When the fruit turns red, the small green spots on the fruit surface do not turn red.

Control formula:

2.1% butyl buckwheat + 2% chun eraomycin + 50% chlorobromoisocyanuric acid;

3% thiazolone + thiazolidine + difenoconazole + photosynthetic power foliar fertilizer