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发表于 2016-10-7 03:16:01 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
Because the sun rises later, morning temperatures remain cool and dew stays on plants and flowers longer. As little as five a long time of dew promotes development of Cercospora foliage spot.
September weather while in the Lowcountry is ideal for Cercospora. The fungus wants temperatures below 86 certifications during the day and above Fifty-five degrees at night. It also loves the alternating pattern of wet leaves at night and dry leaves during the day.
Over the past few years, Cercospora leaf spot on crepe myrtle is widespread in the southeastern Usa. It appears as early as the beginning of June, even in years with usual rainfall.
You may not recognize Cercospora leaf spot as a disease for crepe myrtle because the disease causes actually leaves to turn color prematurely plus drop, as they normally conduct later in the fall. In the event you examine diseased leaves strongly, you will see brown spots caused by Cercospora one of several yellows, oranges and grays.
Does Cercospora leaf spot cause harm to crepe myrtles? The short answer is probably not.
Crepe myrtles will be tough plants. (Some endure "crepe murder" each spring.) All three associated with my crepe myrtles get Cercospora leaf identify. Losing leaves a month early definitely has not impacted continuing development of the 'Natchez' crepe myrtle in my yard.
Could there be anything to do about Cercospora foliage spot on crepe myrtle? Again, the short reply is probably not. Most crepe myrtles are too large to spray easily which has a hose end sprayer.
To som alle er vigtige for sundhed og forebyggelse af visse sygdomme prevent Cercospora foliage spot on a small crepe myrtle, a fungicide, like Daconil, should be sprayed by August. 1.
Last year's gone down leaves are the main source of the issue. The Cercospora fungus survives within these old, diseased leaves. Fungus spores are blown by wind flow and splashed by rainwater from fallen leaves right up into trees and through leaf to leaf.
Mainly because crepe myrtles produce so many small departs, it is impossible to clean way up every one. Removing and removing most of the diseased leaves out of under trees, however, is a good sanitation practice.
Diseased foliage should not be put in home rich compost piles. Temperatures of One hundred and forty degrees are needed to kill fungus infection. Most home compost hemroids do not reach this temperature, so killing is not certain.
Other woody plants which include fig and hydrangea also get Cercospora violin 65 leaf identify. The leaf spots are usually round, brown and may possess target like rings included. On camellia, spots are commonly considered gray patches along the corners of leaves. The gray coloring makes it easy to find the characteristic dark dots where spores form.
The fungus also affects a number of vegetable crops, including beet, carrot, watermelon, mustard vegetables and Chinese cabbage.
Beet may be the vegetable crop most likely to be destroyed. Organic beet seedlings with your five leaves can have Cercospora leaf correct all five leaves. Your leaf spots on beet are perfectly round and passed yellow with a reddish ring.
On mustard and Chinese clothing, the circular, light liver spots start on the older departs. Because these two crops tend to be closely related, Cercospora leaf place can spread from one to another and to other related crops, similar to broccoli. Other vegetables in addition to ornamentals have their zeevaart en de Archeologie van Maritieme Landschappen Bij nader onderzoek own specific types of leaf spot that affect only one plants (or several closely associated crops).
Conventional fungicides are comparatively effective at controlling Cercospora leaf location. Organic fungicides, however, do not have a great deal effect on this disease. Copper or perhaps Bacillus products likely are the best bets among organic approved fungicides. In order to work, they must be applied now as well as before Cercospora leaf spot will start.
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