Colorful Leaf Plant Disease and Pest Control
Article Abstract: Explanation of colorful leaf plant aspects in the flower clinic, disease and pest control of colorful leaf plant, next is a comprehensive introduction.
1. Seedling Stage Control High temperature and humidity in the greenhouse are extremely suitable for the reproduction of various pathogenic bacteria, and the most serious disease and the greatest harm is bakanae disease, which is caused by Fusarium, Rhizoctonia, and Pythium. It is most severe about 20 days after the seedlings emerge from the soil, and soil-borne bacteria are the main cause of the disease. The symptoms include: plant wilt, collapse, and rot. At this time, water irrigation should be controlled, ventilation should be appropriate, and Green Harvest No. 1 and Green Harvest No. 2 should be sprayed for chemical control after the seedlings emerge from the soil.
2. Growth Stage Control
(1) Common Diseases and Control Methods Grey Mold: This is a common fungal disease in ornamental grasses, caused by Botrytis cinerea, which can harm leaves, stems, flowers, and fruits. The leaves initially show water-soaked spots that gradually expand and turn brown or blackish-brown and soft腐烂. The same happens to flower buds. When humidity is high, a grey moldy substance appears on the affected area, and this disease is prone to recurrence, so the control of grey mold must be persistent. In terms of maintenance management, less nitrogen fertilizer should be applied, and in terms of chemical control, Agricultural Lining, Shijiale, Grey Mold Killer, and Ridomil can be used. Downy Mildew: It is also a fungal disease that invades from the root or stem base of the flower. The affected area initially shows water-soaked dark green spots, which can develop into blackish-brown plaques, and in severe cases, the entire stem turns black and rots, causing the cortex to dysfunction, ultimately leading to plant death. For this disease, you can choose to spray with Frost and Mildew Fast, Antai Sheng, Mancozeb, and Ridomil.
Sclerotinia Disease: It is caused by Sclerotinia sclerotiorum. The pathogen also invades from the stem base, initially causing light brown water-soaked spots that spread to the stem and petiole; rot, and when moist, white cottony mycelium appears on the affected area. This disease can be controlled by spraying with Pentachloronitrobenzene, Sclerotinia Net, and Sclerotinia Killer.
White绢 Disease: The pathogen mainly invades the stem and root of the plant. It often occurs at the base of the stem, where the affected area shows brown rot and white silk-like substance grows on the lesion. A 5% carbendazim 1000x solution can be sprayed on the root soil for control.
Bacterial Soft Rot: The affected area initially shows water-soaked spots, then turns brown and becomes slimy and soft腐烂, with white, yellow, or greyish-brown sticky substances mixed in the腐烂 tissue and emitting a foul odor. Agricultural streptomycin can be used for chemical control, spraying the affected plants and root soil.
Downy Mildew, Sclerotinia Disease, White绢 Disease, and Bacterial Soft Rot have similar symptoms and require careful analysis. Although they are all controlled by reducing watering and proper ventilation in cultivation management, their chemical controls are different. Powdery Mildew: It harms the tender leaves, flower buds, and peduncles of flowers. Initially, white powdery spots appear on the affected area, gradually covering the surface with a layer of white powdery substance. The affected area becomes twisted and deformed, with small flowers or no flowers at all. This disease is often found on plants like Cineraria, Celosia, and Chinese Rose. Chemical control can use Metalaxyl, Fuxing, etc.
Rust Disease: This disease commonly occurs on leaves, fruits, and branches, often seen on chrysanthemums, with orange-yellow to dark brown powdery masses, pustules, or hair-like substances on the affected area. Powder rust control, Metalaxyl, Carbendazim, and Fuxing can be used for chemical control.
Black Spot Disease, Brown Spot Disease: These two diseases mainly harm leaves, and water irrigation should be reduced and humidity lowered. Chemical control can use Chlorothalonil, Metalaxyl.
Virus Disease: It is a disease caused by very small parasites, and affected plants may show symptoms such as twisting, curling, and dwarfing. Control agents include Jiedu Kang, Xiaoye Enemy, and Virus A mixed spray, W2000, etc.
(2) Common Pests and Control Methods Red Spider Mites: Occur in high-temperature, low-humidity environments, with the affected area losing green color and showing grey-yellow spots, eventually leading to leaf drop. Chemical control can use Dimethoate, Oxidized Dimethoate, Belebao,天王 Star, and Dichlorvos.
Aphids: Often absorb nutrients from the back of leaves, causing leaf discoloration and curling. Chemical control can use Dichlorvos, Dimethoate, Yibianqing, and Kcanfu.
Scales: There are many types, small in size, often covered with waxy scales. Chemical control can use Quick Kill Scales, Oxidized Dimethoate, and Dichlorvos.
Whiteflies: Small, white, not strong in flying ability, with affected leaves turning yellow and falling off. Control can use Fenvalerate, Dimethoate, Oxidized Dimethoate, and Dichlorvos sprays. Leafminer Flies: Larvae bore into the leaf flesh of flowers, creating winding yellow-white tunnels in the leaves. They start causing harm in May and continue until August. A 40% Oxidized Dimethoate Emulsion 1000x solution can be used for root irrigation control.
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