Hybrid Magnolia leaf blight
The main symptoms occur on the leaves, and in severe cases, they can spread to petioles and buds. The disease spot mostly occurs at the leaf edge, the initial stage is faded green macula, watery, many disease spots are connected into pieces, the fan shape extends outward, the edge is dark brown, and the inside is grayish yellow, which can cause early defoliation. In a humid environment, black-gray grains appear on the fallen leaves.
The cause of the disease is a fungal disease; the pathogen lives in the leaf bud and on the remnant of the diseased plant, and by means of airflow transmission, it can be infected directly from the stomata of the leaves with weak growth or physiological injury. under the environmental conditions of high wind speed and low air humidity, it is beneficial to the occurrence of the disease, and the disease is serious in the high temperature and dry environment.
Control methods when flower buds and leaf buds are not unfolded, spray Baume 3 to 5 degrees stone sulfur mixture to the branches. Where there are conditions, wind barriers (windproof facilities) can be set up in winter to avoid the occurrence of physiological diseases. Increase foliar spray in spring to improve air humidity in the small environment. At the initial stage of the disease, 800 times of chlorothalonil and carbendazim were sprayed.
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Control of Fusarium Wilt of Cymbidium
Symptomatic Fusarium wilt is a serious disease of Cymbidium. Seriously diseased plants die in a few weeks, and generally diseased plants can survive for a year or more. The aboveground symptoms of Fusarium wilt are similar to those caused by RhizoctoniasolaniKuhn, that is, the leaves turn yellow and wilt, the pseudo-bulbs become thinner and twisted, and finally lead to root rot. But Fusarium caused a globular purplish red color, and finally the rhizome was invaded and turned purplish red. When the disease is serious, the pseudobulb decays deeply. Onset of disease
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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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