Grow powdery mildew resistant crops if possible. Remove or till under any crop refuse as soon after harvest as possible. If any sign of the disease appears to be present on seedlings, discard them and any sown nearby that may have been infected. See also Watermelon gummy stem blight (Fact Sheet no.
#Gummy stem free#
Treatment for Watermelons with Gummy Stem BlightĪs mentioned, gummy stem blight develops from contaminated seed or infected transplants, so vigilance regarding infection is necessary and use of disease free seed. Cucumner gummy stem blight, cucubit gummy stem blight, gummy stem blight of cucurbits. The fruit rot phase has a separate name, black rot. citrulli is the most widespread of the three species. cucurbitacearum ( formerly Didymella bryoniae and Phoma cucurbitacearum).
If the infection is spread to the fruit as black rot, the infection may be evident in the garden or develop later on during storage. BASICS Scientific name: Stagonosporopsis citrulli S. Gummy stem blight does not directly affect the melons, but can indirectly affect the size and quality of the fruit. Older stems at the crown near a leaf petiole or tendril split and ooze. Irregular brown to black blotches appear between leaf veins, gradually expanding and resulting in the death of the affected foliage. As the disease progresses, gummy stem blight symptoms increase. The first symptoms of gummy stem blight of watermelons appear as round black, wrinkled lesions on young leaves and dark sunken areas on the stems. Symptoms of Watermelons with Gummy Stem Blight Black rot refers to the same disease on fruit, and is seen less often than the foliar phase. Muskmelon (cantaloupe), cucumber, and watermelon are most commonly affected by this phase of the disease. Wounds on the plant either caused by mechanical equipment or insect feeding along with powdery mildew infection predispose the plant to infection. Gummy stem blight is the name given to the disease when leaves and stems are infected. It has teleomorphic (sexually reproducing) and anamorphic (asexual) states 38,39. bryoniae (Auersw.) Rehm (the oldest name) and its anamorph Phoma cucurbitacearum (Fr.: Fr.) Sacc.arebased on morphological similarities 38. (24 C.), relative humidity over 85% and leaf wetness from 1-10 hours. Gummy stem blight (GSB) is caused by the ascomycete fungus D. Periods of high temperature, moisture and humidity foster the disease – 75 F. It can be present in or on infested seed, or overwinter for a year and a half on infected crop residue. Watermelon gummy stem blight is caused by the fungus Didymella bryoniae. Keep reading to find out what causes gummy stem blight and symptoms of the disease. Gummy stem blight of watermelons and other cucurbits refers to the foliar and stem infecting phase of the disease and black rot refers to the fruit rotting phase. It has been found in these crops since the early 1900s. Watermelon gummy stem blight is a serious disease that afflicts all major cucurbits.
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