Control methods of Camellia anthracnose (Picture)

Symptoms and pathological changes of camellia anthracnose: camellia anthracnose mainly harms leaves. On the diseased leaves, there are round or irregularly shaped brown to grayish brown disease spots, the edges are dark or yellow halo, some of the disease spots are gray-white, leaf spots are sunken or have dark edges.

Small black spots are streaked or scattered on the disease spot. Pink gel appeared on the small spots when it was wet, and the diseased leaves were easy to fall off, and in severe cases, only a few leaves remained in the whole plant; light brown spots appeared on the branches, then gradually withered, grayish white, with black spots, and in severe cases, the disease spots spread downward and withered the branches.

Prevention and control methods:

1. Strengthen the management of fertilizer and water, do a good job of ditching and drainage in the nursery, prevent the soil from being too wet, and enhance plant disease resistance.

2. In winter, combined with pruning to remove diseased branches and leaves, remove fallen leaves and destroy them centrally.

3. Chemical control: it can be sprayed with 500x solution of 25 carbon tetralin wettable powder or 800,1000 times liquid of 50% topiramine wettable powder or 1000 times liquid of 50% carbendazim wettable powder. Spraying 0.3% "0.4%" potassium hydrogen phosphate solution can enhance plant resistance.

Prevention and control of camellia anthracnose (figure) symptoms and pathological changes of camellia anthracnose: camellia anthracnose mainly harms leaves. On the diseased leaves, there are round or irregularly shaped brown to grayish brown disease spots, the edges are dark or yellow halo, some of the disease spots are gray-white, leaf spots are sunken or have dark edges. Small black spots are streaked or scattered on the disease spot. Pink gel appeared on the small spots when it was wet, and the diseased leaves were easy to fall off, and in severe cases, only a few leaves remained in the whole plant; light brown spots appeared on the branches, then gradually withered, grayish white, with black spots, and in severe cases, the disease spots spread downward and withered the branches. Prevention and control methods: 1. Strengthen fertilizer and water management, do a good job in nursery ditching and drainage, prevent soil from being too wet, and enhance plant disease resistance. 2. 2. In winter, combined with pruning to remove diseased branches and leaves, remove fallen leaves and destroy them centrally. 3. Chemical control: it can be sprayed with 500x solution of 25 carbon tetralin wettable powder or 800,1000 times liquid of 50% topiramine wettable powder or 1000 times liquid of 50% carbendazim wettable powder. Spraying 0.3%-0.4% potassium dihydrogen phosphate solution can enhance plant resistance. Control methods of anthracnose of Camellia

Symptoms mainly harm leaves and tender shoots, pathogens mostly invade from leaf tips and leaf edges to form round or irregular disease spots, dark brown, edge uplift, disease spots of different sizes, black spots grow on the disease spots in the later stage, whorled or scattered. When the humidity is high, it overflows the pink sticky mass. The diseased leaves are dry and easy to fall off, and the new shoot disease spots are long, slightly sunken, light brown, with obvious edges, and when the branches are serious, the shoots die.

The pathogen overwintered on the diseased plant and remnant in the form of mycelium or conidia, spread through wind and rain, and invaded from the wound and weak part. Plant growth is weak and drainage is poor. High temperature and high humidity are conducive to the occurrence of diseases.

Prevention and cure method

1. Remove dead branches and fallen leaves, cut off diseased branches and destroy them.

2. Increase the application of organic fertilizer, phosphorus and potassium fertilizer and ferrous sulfate to enhance disease resistance.

3. After the new shoots were extracted, the protective fungicides were sprayed with 50% carbendazim 800x solution, 70% methyl topiramate 1000 fold solution, 75% chlorothalonil 800x solution or 80% anthrax Fumei 800x solution, once every 10 to 15 days, for 5 times in a row.