Pest control methods for diamond roses: Black spot: mainly invades the leaves, petiole and young shoots. When the leaves are first onset, there are purple-brown to brown spots on the front, and most of them are round or amorphous dark brown spots. Powdery mildew: Infested young leaves, white powder appeared on both sides, early disease is not obvious, after 3 to 5 days of white powder layer, the leaves are water-stained, gradually losing green to yellow, causing the leaves to fall off when severely injured. Leaf blight: Most leaf tips or leaf margins invade, initially yellow spots, and then rapidly inwardly expand into irregular large spots, severely affected whole leaves are up to 2/3, the diseased parts are chlorotic yellow, brown dry Fall off. Scale insects: In the process of cultivating diamond roses, it is found that there are individual branches or leaves with scale insects, which can be gently brushed with a soft brush or combined with trimming to cut off the insects and insects. Ask to brush, cut, concentrate, and don't throw it. According to the various occurrences of scale insects, spray at the nymph. Therefore, most of the nymphs hatch much, the body surface has not yet secreted wax, the shell is not formed, and the medication is still easy to kill. Spray once every 7~10 days for 2~3 times. 40% omethoate 1000 times solution, or 50% malathion 1500 times solution, or 255 imipenem 1000 times solution, or 50% dichlorvos 1000 times solution, or 2.5% deltamethrin 3000 times solution, spray. In addition to strengthening the management of the above diseases, in addition to strengthening the management of fertilizer and water, the diseased leaves should be cut off in winter, the underground leaves should be removed, and the source of initial invasion should be reduced. Comprehensive prevention and treatment should be taken when the disease occurs, and bactericidal agents such as carbendazim and methyl thiophanate should be sprayed.
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