Pest Control:
(I) Diseases
1. Powdery mildew
(1) Onset: onset in early July, and August on the peak.
(2) Incidence conditions: high temperature and humidity are prone to onset.
(3) Symptoms: Both the seedling stage and the ripening stage are onset, and they begin to spread gradually upward from the lower leaves of the plant. `There are a lot of white powder on the back of the initial leaf, when there are serious black spots on the leaves, causing the leaves to yellow off the whole plant withered and died.
(4) Control methods: From the beginning of July, use 50% carbendazim 800 times solution or 50% sterilization Dan 200 times or 50% thiophanate 1000 times solution, spray once every 10 days, spray 2-3 times Can control the spread.
2, root rot (root)
(1) Onset: The onset began in late April and has been spreading until July-August.
(2) Incidence conditions: low temperature and rain, poor drainage, prone to the disease.
(3) Symptoms: The underground stems turned gray and white, and the roots gradually rotted. The leaves of plants were yellow and died.
(4) Control methods: Remove the roots and lime in the diseased holes.
(b) Insect pests
1, heartworm
(1) Occurrence: From June to July.
(2) Occurrence conditions: high temperatures and wet weather are prone to occur.
(3) Damaged parts: drill into the pods and harm the seeds.
(4) Control methods: Dichlorvos 200 times solution or dimethoate 200 solution, from flowering period to fruiting period, spraying once every 10 days, spraying 3-4 times.
2, locusts
(1) Occurrence: From June to July.
(2) Injury site: The back of the leaf or stem sucks juice.
(3) Control methods: Weed removal. Use 40% dimethoate 2000 times, spray once every 7 days, spray 3 times.
3, Lala
(1) Occurrence period: April activity, May-October.
(2) Harmful parts: bite the root and cause seedling deficiency.
(3) Control methods: Mix and grind each of the poisonous plants such as Stellera gossypii, one hundred species, etc., and throw it into the ground to kill insects.
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