Cucumber Disease
Gummy stem blight is a stem and leaf disease of cucumber cantaloupe pumpkin and watermelon caused by the fungus Didymella bryoniae. Physical barriers such as different types of garden cloth or sprays that coat the leaves can be used.
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Cucumber Mosaic Virus Tiny sap-sucking aphid insects transmit this disease to cucumbers.
Cucumber disease. The blights most commonly affecting cucumbers include. The diseases can spread through the soil water air infected tools animals and even gardeners themselves. A bacterial cucumber disease can enter through the roots or be carried with insects.
Fruiting bodies pycnidia of the pathogen are evident in the lesion as tiny black dots. Lesions caused by gummy stem blight on cucumber leaf smaller lesions. Most cucumber diseases are caused by pest problems in your cucumber patch.
They can be airborne or soil-borne and some are able to survive the winter in certain regions making them a constant threat. Many textbooks and factsheets on plant diseases describe individual diseases with a single causal organism such as Powdery Mildew or Downy Mildew diseases of cucumbers. Disease complex is where more than one causal organism act together.
Symptoms include a mosaic pattern on leaves that in severe cases result in a shoestring effect. This fungus also causes a fruit rot called black rot. These lesions expand until they become limited by the larger secondary veins in the leaf giving the spots an angular shape Figure 1.
Large lesion in center caused by target leaf spot foliar lesion showing black pycnidia embedded in necrotic tissue on adaxial surface. As fungal diseases cucumber blights can spread into the garden on wind currents and throughout it by splashing water. Most active during warm rainy weather they survive for long periods in infected plant debris.
Many hybrid cucumber varieties today have been engineered to be disease resistant but not disease proof. Fruits can be malformed and bumpy and seeds can also be malformed. Symptoms include leaves with brown or tan spots of various sizes that may eventually cover the entire leaf.
This Primefact covers common cucurbit diseases caused by fungi bacteria and viruses. Contaminated garden tools also spread it. And they certainly arent resistant to pests.
Cucumber plants are susceptible to three main pests. Spot diseases on your cucumber plants sooner so you can treat plants before they are destroyed by disease and can successfully manage symptoms. In some cases they can interact so their combined effect is greater than the sum of their individual effects.
Cucumber Leaf Disease Angular leaf spot Powdery mildew Downy mildew Bacterial wilt Fusarium wilt. The disease is caused by a bacterium and the initial symptoms are small water-soaked spots that develop on the undersides of leaves. It is a ubiquitous disease in cultures of cucumbers melons courgettes and other cucurbits and it appears in greenhouses and solariums causing significant damage to the crops.
Angular leaf spot is one of the most widespread diseases of cucumber. Cucumber plant diseases are caused by bacteria fungi and viruses. There are other less common diseases affecting cucurbits which are not covered here.
Viral diseases May be caused by cucumber mosaic virus CMV squash mosaic virus SqMV watermelon mosaic virus WMV and zucchini yellow mosaic virus ZYMV. Consider sending samples to a plant disease diagnostic laboratory. Affected leaves develop yellow spots streaks and veins and fruits become mottled or warty.
Powdery mildew on cucurbits is produced by the fungus Sphaerotheca fuliginea. Although descriptions of the more common diseases have been given to assist with identification it can be difficult to diagnose some diseases with similar symptoms.
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