What season do rose of Sharon flowers bloom, and what are the key points for pest and disease control?
Rose of Sharon, also known as shaving brush tree, jingtiao, zhaokai muluo hua, and trumpet flower, is a fairly common ornamental garden flower. It is planted in all parts of our country, and can be used as a hedge or planted on its own. The flowers, seeds, bark, and leaves of rose of Sharon can also be used as medicine, and have the effect of preventing and treating viral diseases and lowering cholesterol. Let's take a look below at what season rose of Sharon generally blooms in and what the key points for pest and disease control are.
1. What season does rose of Sharon generally bloom in?
The flowering period of rose of Sharon is very long. Blooming actually varies with region; generally the south blooms earlier, while northern regions bloom somewhat later. In the Jiangsu and Zhejiang areas, it blooms in June, reaches full bloom from August to September, and blooms less after October. In South China, rose of Sharon generally begins blooming in May.
2. What are the key points for pest and disease control in rose of Sharon?
(1) Rose of Sharon brown spot
Symptoms: It mainly harms the leaves. The lesions are polygonal, dark brown, and 3-10mm in size. When humidity is high, dark brown velvety matter grows on the back of the leaves, namely the pathogen's conidiophores and conidia. The lesions are sparse, and the back of the leaf has diffuse patches, sometimes fusing together.
Control methods:
1. Care for the plant carefully, fertilize reasonably, and appropriately increase the application of organic fertilizer.
2. In late autumn, thoroughly remove fallen diseased leaves and diseased leaves on the branches, and bury them deeply or burn them in a centralized manner.
3. In the early stage of the disease, spray 50% thiophanate-methyl 800-fold solution or 50% carbendazim 500-fold solution, about once every 10 days, for 2-3 consecutive sprays.
(2) Damage from leaf spot disease and rust disease
Control method: Spray with 65% zineb wettable powder 600-fold solution.
Pests also include whiteflies and scarab beetles, mainly aphids, as well as inchworms and leaf rollers.
Control method: Spray with 40% omethoate emulsifiable concentrate 1000-fold solution to kill them. An environmentally safe pest control method is diluted detergent.
(3) White-spotted scarab beetle
Also called “jing ke lang”, it harms rose of Sharon, Chinese rose, daylily, and others, with adults biting and eating tender buds, leaves, flowers, and flower buds.
Control methods:
1. Manually capture the adults.
2. The larvae gather in places such as thoroughly decomposed manure piles near the flower nursery. Before June, when the adults have not yet emerged, turn the soil and pick out the larvae and pupae.
1. When the adults are at peak outbreak and causing damage, spray 40% omethoate emulsifiable concentrate 1000-fold solution for control.
(4) Aphids
Aphids can be considered a bitter foe for rose of Sharon, and are also the most common pest of rose of Sharon. When an outbreak occurs, the leaves and branches of rose of Sharon are all seriously affected, causing it to fail to bloom on schedule, and possibly leading to the appearance of other diseases as well, so dealing with aphids is a very serious matter.
For aphid control, everyone needs to care for the plant carefully and check the branches and leaves regularly. If the color of the leaves or branches begins to show signs of turning yellow, special attention is needed, because it is very likely to be infested by aphids. To deal with aphids, the best method is to directly use insecticide; 50% Huahushen or carbendazim solution can be used to kill them, and afterward it can also achieve a preventive and control effect.