Inquiries: Kushiro Rose Daejeon leaves fall off and plant death. What are the reasons? Is there a remedy?
Answer: There are two reasons: one is a rose blight caused by a fungus; the other is due to a root pest that is affected by underground pests such as cockroaches (scarab larvae).
Prevention methods: 1. For rose blight, it is recommended to use “Lishuling†and “thiophanate-methyl†pesticides to water the required concentration, and use a sprayer (15kg) to treat 10 diseased plants and remove the sprayer. Targeting the outlet of the disease directly in the middle of the diseased plant cluster (close to the ground) and irrigating the root can effectively inhibit the death of the plant. 2. It is recommended to use “toxic xin†for the problem of whole plant death caused by the underground pests represented by cockroaches (this product is a highly effective underground insecticide that contains the original drug of chlorpyrifos and phoxim, and it has contact and stomach poisons. A certain fumigation effect, long duration in the soil, efficacy is stable.) Irrigation after the application of granules is better. The dosage is 5 ~ 7 kg per mu, and the effect of timely watering after use is ideal.
Auxiliary measures: Before using the medicine, it is best to use a pruning shear to remove the twigs of roses and chlorosis caused by diseases and insect pests. The purpose is to reduce the ineffective consumption of photosynthetic nutrients and the balance of water metabolism, and to maximize scientific application of pesticides. Reduce the rate of death of bitter rose roses.
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