Control methods of black spot of Magnolia
The main results are as follows: (1) strengthen the nursery management, enhance the tree potential and improve the disease resistance. Select loose, fertile and well-drained soil, apply fully rotten cake fertilizer, loosen the soil and water in time, and pay attention to frost prevention in the north.
(2) remove the fallen leaves on the ground in time, cut off the seriously diseased leaves from the trees, and concentrate on burying them deeply.
(3) in the early stage of the disease, spraying 1purl 160 Bordeaux solution or 0.3~0.5Be stone sulfur mixture 77% can kill wettable powder, 30% king copper suspension, 25% ammonia copper solution, 50% trichlorothalonil wettable powder 600 times 800 times, 75% chlorothalonil wettable powder 800 times solution 70% methyl thiothalonil wettable powder 1000 times, etc., spray once every 10 to 15 days, 2 times in a row.
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Black spot of rhododendron
Rhododendron black spot, also known as brown spot, is a common multiple leaf spot disease of rhododendron. After the disease, the leaves formed black spots, which gradually dried up and fell off until the plant died. The disease mainly harms the leaves of rhododendron, which is infected by Cercospora rhododendron fungi, and several brown spots begin to appear. With the continuous expansion of the spots, the disease spots connect with each other and produce gray-brown fungal hyphae, and the damaged leaves start from the petiole and fall off early from green to brown, which seriously affects the growth, development and ornamental value of rhododendron. The pathogen overwinters on leaves or diseased plants.
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Prevention and control techniques of black spot of rose
Rose black spot occurs in many places. The disease harms the rose, makes the leaves withered and yellow, falls early, causes the second leaf of the rose in the same year, weakens the growth potential of the plant and reduces the yield of cut flowers. First, the symptoms of rose black spot mainly affect the leaves, but also affect the petiole, leaf veins, shoots and other parts. In the early stage of the disease, small brown spots appeared on the front of the leaves, which gradually expanded into round, round or irregular spots. The lesion is 2-12 mm in diameter, dark purple and radiating at the edge. In the later stage, the central tissue of the lesion became gray and white, and a lot of black was scattered on it.
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