How to prevent black spot in rose leaves

Rose black spot is a worldwide disease. The disease mainly affects the leaves of the rose, but also affects the petioles, veins, shoots, buds and other parts. At the early stage of disease, small brown spots appeared on the front of the leaves and gradually expanded into round, near-circular or irregular black-purple spots, and the edges of the lesions were radial. In the later stages, the central tissue of the lesions turned grayish, with small black spots on them, which are the conidia discs of the pathogenic bacteria.

In some rose varieties, the tissues around the lesions turn yellow, and some species have a green tissue between yellow and lesions, called "green islands." The lesions are connected to each other and the leaves turn yellow off. The lesions on the young shoots were purple-brown, long oval spots that soon turned black and the lesions rose slightly. The lesions on petiole and veins are similar to those on young shoots. The lesions on the buds are mostly purple-brown oval spots.

Control methods:

1 Remove diseased leaves and destroy them in time;

2 At the beginning of leaf development or early onset in the spring, use 45% Thiabendazole (Texaco) suspension 500 times to 600 times, or 70% chlorothalonil wettable powder 500 times, alternately. , Every 7 days to 10 days, once or more than 3 times, the control effect is better. The use of chlorothalonil alone is more effective than carbendazim.

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