Control Methods for Common Diseases and Pests of Lilacs
About the introduction of this floral clinic for lilacs, the control methods for common diseases and pests of lilacs, corrections are welcome if there are any mistakes!
One, Black Spot Disease of Lilacs
Symptoms: Mainly affects the leaves. Lesions are round or nearly round, brown or dark brown, slightly with concentric rings. Both sides of the lesions have black霉状物质, which is the conidial phialides and conidia of the pathogen.
Control Methods:
1. Promptly clear the diseased and residual bodies after defoliation to reduce the source of fungi.
2. Spray with a 75% chlorothalonil 600x solution or a 50% polyoxin 1000x solution.
Two, Brown Spot Disease of Lilacs
Symptoms: Mainly affects the leaves, an important disease of lilacs, initially producing round or nearly round to irregular lesions on the leaves, surrounded by a fine brown line, the center is light brown, 3-12mm in size. Later, black-brown villous spots appear on the lesions, which are the fruit bodies of the pathogen. In severe cases, the leaves are covered with dozens of lesions.
Control Methods:
After the lilacs have unfolded their leaves, spray with a 50% benomyl 1000x solution or a 50% methylthiophanate 800x solution, 50% carbendazim 600x solution. Every 10-15 days, apply 2-3 times.
Three, Powdery Mildew Disease of Lilacs
Symptoms: The disease starts with scattered powdery spots, then expands into patches, covering the entire leaf with a white powdery layer of conidia and mycelium. Finally, the white powdery layer turns into a thin grayish ash color, and black granular cleistothecia appear successively.
Control Methods:
1. Clear away the fallen leaves to eliminate the overwintering pathogen.
2. Prune dense branches to facilitate ventilation and light.
3. During the outbreak, spray with a 50% benlate wettable powder 1000x solution or a 25% myclobutanil wettable powder.
Four, Leaf Spot Disease of Lilacs
Symptoms: Mainly occurs on leaves and fruits, and can be divided into four types according to the degree of damage to the host: starry spot, dot spot, flower spot, and burn spot.
Control Methods:
1. Ensure timely drainage so that there is no standing water on the ground after rain.
2. Spray with a 1:1:100 Bordeaux mixture solution at the beginning of the outbreak.
Five, Lilac Leafminer Beetle
Hosts include Korean lilacs and ligustrum.
Harmful Characteristics: Adult beetles feed on leaf flesh, larvae mine the leaf flesh, forming winding trails on the leaves.
Control Methods:
Apply a 40% dimethoate emulsifiable oil 1000x solution spray, which is effective against adults, larvae, and eggs.
The above content introduces the common diseases and pest control methods of lilacs, hoping it is helpful to you!