How should pests and diseases of Paris polyotphylla var. yunnanensis seedlings be controlled?
How should pests and diseases of Paris polyphylla var. yunnanensis seedlings be controlled? Please provide an introduction to the methods. For pests and diseases at the seedling stage of Paris polyphylla var. yunnanensis, the following methods can be used for control: 1. Pest control. The main pests at the seedling stage are cutworms, white grubs, and others. For cutworms and white grubs, use 180-200 g of 90% trichlorfon crystals per mu, mix with 8-10 kg of roasted rice bran to make a poisonous...
How should pests and diseases of Paris polyphylla var. yunnanensis seedlings be controlled? Please provide an introduction to the methods.
For pests and diseases at the seedling stage of Paris polyphylla var. yunnanensis, the following methods can be used for control:
1. Pest control. The main pests at the seedling stage are cutworms, white grubs, and others. For cutworms and white grubs, use 180-200 g of 90% trichlorfon crystals per mu, mix with 8-10 kg of roasted rice bran to make a poisonous bait for trapping and killing.
2. Disease control. The main diseases at the seedling stage are root rot, damping-off, and others. The causes of root rot are high field humidity, waterlogging, high temperatures in June-July, and wounds on the rhizome, making it susceptible to infection by pathogens. Control methods: after seedling emergence, mix 200 mg/L agricultural streptomycin with 250-fold dilution of 25% carbendazim wettable powder and spray for control; in the early stage of disease onset, apply 1% ferrous sulfate solution or quicklime into the diseased holes for disinfection. The main causes of damping-off are soil-borne pathogens and waterlogging. Control methods: in the early stage of disease onset, spray with 300-fold dilution of 25% metalaxyl wettable powder, or spray with 50% carbendazim wettable powder, spraying once every 7 days for 2-3 consecutive times; after disease onset, promptly pull out diseased plants and irrigate the diseased area with 500-fold dilution of copper sulfate.
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