How to prevent and control pests and diseases in autumn-stubble small bok choy?
In traditional rapeseed cultivation, the first step is to raise seedlings in a seedbed, then plow the main field, make beds, and transplant. The many steps, high labor demand, great labor intensity, and high cost restrict the expansion of rapeseed planting area and the improvement of economic returns. In recent years, other places and local areas have been demonstrating and gradually promoting a new rapeseed cultivation technique...
1. Pest control: The main pests are aphids, cabbage caterpillars, and diamondback moths. To control aphids, spray with 25% Ekatin 1000x solution or 50% pirimicarb 2000x solution, or fumigate with 250 g of aphid-killing smoke agent per mu, and yellow sticky traps can also be used for trapping and killing. To control cabbage caterpillars and diamondback moths, spray with 2.5% Caixi 1000-1500x solution or Caichong Yisaoguang 1000-1500x solution.2. Disease control: Focus on controlling downy mildew, black spot, and anthracnose. For downy mildew, biological control can be used, that is, spray a solution made from 250 g each of hot pepper, ginger, and garlic (juice) mixed with 50 kg of water; 75% chlorothalonil wettable powder 600x solution, 72.2% Kekangling wettable powder 600x solution, or 40% phosethyl-Al wettable powder 500x solution can also be sprayed for control. For black spot, in the early stage of the disease, 50% carbendazim wettable powder 600x solution can be sprayed for control. For anthracnose, in the early stage of the disease, 70% thiophanate-methyl wettable powder 500-600x solution or 80% anthracnose Fumei wettable powder 800x solution can be sprayed.