What if the new leaves of Camellia oleifera fall off
I bought a pot of tea plum from the south, which has been growing well for three years, but from this spring, red dots appeared on the new leaves, and soon the leaves fell off, and the effect of carbendazim was not good. What is the cause of this, please? How should prevention and treatment be carried out?
A: from the situation you have described, combined with the leaves of the clip, it is inferred that it is caused by net cake disease after the new leaves are harmed by mites. The disease occurs more seriously from April to June and from September to October. It mainly occurs on the new leaves which have been fully spread, and the old leaves suffer less. Disease spots often occur at the edge or tip of the leaf, but can also occur in other parts of the leaf. At the initial stage, needle-sized oily dots were produced on the diseased leaves, which were light green, and then the plaques gradually expanded and showed dark brown. The tissue of the disease becomes thicker and sometimes rolls upward, and a reticular process appears along the vein on the back of the leaf. Prevention and control methods: pay attention to the prevention and control of mites, can be sprayed with 1500 times of 25% Baileba wettable powder or 2000 times of methothalonil EC; at the initial stage of the disease, spray alternately with 1000 times of 75% chlorothalonil wettable powder, or 1000 times of methyl thiophanate wettable powder, or 0.5 Groupe 160 Bordeaux solution, every semimonthly, 3 to 4 times in a row.
- Prev
Experiment on the efficacy of 10% chlorothioline wettable powder in the treatment of tea leafhopper
Efficacy test of 10% chlorothioline wettable powder against tea green leafhopper Abstract: field experiments showed that 10% chlorothioline wettable powder had good control effect on tea small green leafhopper, and the control effect was still more than 80% after 14 days. Key words: chlorothioline; tea small green leafhopper; control effect 10% chlorothioline wettable powder is a nitromethylene internal absorption insecticide. The mechanism of action of chlorothioline is selective inhibition of nicotinic acid acetylcholinesterase receptor in insect nervous system.
- Next
Asparagus tea processing technology
1. Process flow: raw material picking-airing-roller deactivation-air cooling-hot air secondary deactivation-rolling-spreading blank, airing-hot air drying-finished product-packaging 2. Operation points: 1. raw material picking: length 3~3.5cm, cutting length requires high uniformity. 2. Spreading and drying: collect the raw materials, spread them flat in a room with good ventilation and convection conditions, generally use bamboo mats or plastic films as ground bedding, and dry the surface moisture in a natural state. 3. Roll out: spread out
Related
- Fuxing push coffee new agricultural production and marketing class: lack of small-scale processing plants
- Jujube rice field leisure farm deep ploughing Yilan for five years to create a space for organic food and play
- Nongyu Farm-A trial of organic papaya for brave women with advanced technology
- Four points for attention in the prevention and control of diseases and insect pests of edible fungi
- How to add nutrient solution to Edible Fungi
- Is there any good way to control edible fungus mites?
- Open Inoculation Technology of Edible Fungi
- Is there any clever way to use fertilizer for edible fungus in winter?
- What agents are used to kill the pathogens of edible fungi in the mushroom shed?
- Rapid drying of Edible Fungi