Alternaria cucumerina. Rui map Zheng. Alternaria leaf blight. Alternaria cucumerina. Gerald Holmes. Alternaria leaf blight. Alternaria cucumerina. Gerald Holmes. Alternaria cucumerina is an important pathogen of some Cucumis, Cucurbita and Citrullus species with a wide distribution, including several. Alternaria leaf spot or blight of cucurbits or vine crops is caused by the fungus Alternaria cucumerina. The disease is widespread and often damaging in.
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See label for resistance guidelines. Cooperative Extension and other agencies of the U.
Content is available for non-profit, educational use under our Copyright Agreement. Direct infection of the fruit also occurs especially melons but much less frequently. New Disease Reports 23 John Wiley and Sons, New York. The fungus has been found cucumerrina the Far East of Russia on Cucumis melo, Cucumis sativus and Citrullus lanatus Egorova, ; however it has not been reported from other areas of Russia.
Alternaria cucumerina Alternria cucumerina is most common on melons and alrernaria, although it can affect most cucurbit crops. Department of Agriculture cooperating.
Fungal isolates with morphological characteristics similar to those of A. Direct infection is primarily of the leaves and can lead to defoliation.
Alternaria cucumerina (Alternaria Leaf Blight of cucurbits) – Bugwoodwiki
An indirect effect is seen the fruit production. Mikologiya i Fitopatologiy 36 Control Remove crop refuse at the end of the season. Discussion View source History. Young plants and old plants are more susceptible than are mid-season plants.
Another name for this disease is target leaf spot which refers to the appearance of the lesions on the upper surface of the leaves. Plant Disease 78 The infection may also begin at the blossom end with the entire fruit eventually turning brown and shriveling. Rotate cucumerjna non-host crops for at least two years.
Information in this publication is provided purely for educational purposes. Alternaria cucumerina is a fungus of world-wide occurrence which can infect most cucurbits. The occurrence of this disease in Georgia is sometimes sporadic but can be devastating if left unchecked.
Especially important are periods of leaf wetness which allow spores enough time to germinate and penetrate the leaf cucumernia. Alternaria Leaf Spot is caused by Alternaria cucumerina and can cause serious damage under extended periods of wet weather. Lesions can coalesce and the leaves develop a cupped appearance and die.
In general, these measurements are within the size range determined by Simmons for A.
Alternaria cucumerina causing leaf spot of pumpkin newly reported in North Caucasus (Russia)
Rotate away from cucurbits for 1 to 2 years. Control plants were sprayed only with water.
No responsibility is assumed for any problems associated with the use of products or services mentioned. The observed leaf spots were up to mm in diameter with a round greyish altrrnaria pale brown centre and dark brown edges.
After seven days, large solitary conidia were formed on the surface of the agar. Reduce relative humidity in greenhouse operations. Vegetable Disease and Their Cucmuerina. Remove or deep plow plant debris to speed decomposition. Fungicide treated disease-free seed may be helpful. North American Aquatic Connectivity Collaborative.
The fungus survives the winter in infected crop debris as mycelium and may also survive on the seed. Maximize the distance between cucurbit fields to limit spread.
Mikologiya i Fitopatologiya 33 North American Amphibian Monitoring Program. Back to top Cucurbits, Alternaria Leaf Spot. Amistar, Quadris boscalid day schedule. Retrieved from ” http: Common Names and Diseases. Other parts of chcumerina plant are not directly affected. The overwintering fungus serves as alyernaria source of primary infections and spores from these infections cycle the disease through the growing season.
Dry pumpkin leaves affected by alternariosis Alternaria cucumerina cucimerina powdery mildew. Rotations which exclude cucurbits for years may be beneficial. The source of the disease is considered to be dormant mycelium in cucurbit fields and airborne conidia. To our knowledge, this is the first documented detection of A. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.