Control methods of anthracnose in Magnolia
The main results are as follows: (1) strengthen the management of water and fertilizer, increase the application of organic fertilizer and enhance plant disease resistance.
(2) cut off the diseased leaves on the tree in time, clean the diseased and withered leaves on the ground, concentrate and bury them deeply, and reduce the source of infection.
(3) at the initial stage of the disease, 84.1% Dobao wettable powder and 77% Kesha wettable powder were sprayed every 15 days for a total of 2 times. Depending on the condition, spray 75% chlorothalonil wettable powder 600 × 1000 times solution and 70% anthrax Fumei 500 solution and 65% Dysen zinc wettable powder 500 times solution 50% carbendazim wettable powder + 75% chlorothalonil wettable powder 800 times solution 50% mixed sulfur suspension 500 times solution 70% methyl thiophanate ultrafine wettable powder 1500 times solution and so on.
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Control of anthracnose in Phalaenopsis
Phalaenopsis cultivation area, introduction area have no degree of occurrence, harmful to Phalaenopsis and other flowers. Symptoms: the main harm to the leaves, the primary light-colored round spot, and then gradually expanded into brown near-round spot, the edge is dark brown, the middle color is lighter, the late spot gives birth to black spots, the periphery of the spot is yellow. The regularity of the disease: the pathogen is fungus, Alternaria spinifera. When the spores of the pathogen are transmitted by air flow, water droplets, high temperature, sunburn, low temperature, chilling injury, malnutrition and so on, the disease is often easy to occur. Prevention and control methods: (1) Orchid room
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The difference between Drug damage and Fertilizer damage of Rhododendron
Rhododendron has the same characteristics and different performance in drug damage and fertilizer damage. The similarity is that the leaves will wither and fall off in a short time, but the plaque will not expand slowly and the pathogen will not appear on it. The difference between drug damage and fertilizer damage is shown in that azaleas are sensitive to certain or certain pesticides, for example, after spraying certain pesticides, the parts stained with the liquid in the leaves turn yellow, withered and fall off within a few days, seriously affecting the growth of the plant, but not.
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