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On adult leaves, the symptoms appear the same as the ones left by other abiotic or biotic stressors so diagnosis is not as straight forward. They include large irregular leaf lesions which are brown to black in watermelon and reddish brown in melon. Bacterial fruit blotch lesions spread along main midrib in adult leaves. [5]
Bacterial diseases; Bacterial spot Xanthomonas euvesicatoria pv. citrumelo: Black pit (fruit) Pseudomonas syringae: Blast Pseudomonas syringae: Citrus canker: Xanthomonas citri pv. citri: Citrus variegated chlorosis Xylella fastidiosa: Huanglongbing = citrus greening Candidatus Liberibacter asiaticus. Candidatus L. africanus
Stem necrosis is generally absent. The cucumber fruit itself will not display lesions. [1] In melons, such as rockmelon, muskmelon, and cantaloupe, MNSV produces necrotic lesions on the leaves and/or cotyledons. The roots will also exhibit necrotic lesions. The melon fruit decreases in size and displays necrotic spots on the rind as well.
Bacterial diseases; Angular leaf spot Pseudomonas amygdali pv. lachrymans: Bacterial fruit blotch/seedling blight Acidovorax avenae subsp. citrulli = Pseudomonas pseudoalcaligenes subsp. citrulli: Bacterial leaf spot Xanthomonas campestris pv. cucurbitae: Bacterial rind necrosis Erwinia spp. Bacterial soft rot: Erwinia carotovora subsp ...
Temperature and moisture are the most important factors in the spread of gummy stem blight. For watermelon and cucumber, the best temperature for infection is around 25 °C; for melon the best temperature is around 20 °C. [2] Continual leaf wetness from 1–10 hours is necessary for germination, sporulation, and colonization of conidia. [4]
Rinds are lower in sugar and higher in fiber than the flesh of a watermelon, Meyer-Jax says, “When eaten with the rest of the melon, it helps slow down sugar absorption in the gut and mellows ...
Bacterial soft rot on taro (Colocasia esculenta) Bacterial soft rots are caused by several types of bacteria, but most commonly by species of gram-negative bacteria, Erwinia, Pectobacterium, and Pseudomonas. It is a destructive disease of fruits, vegetables, and ornamentals found worldwide, and affects genera from nearly all the plant families.
Liquefactive necrosis (or colliquative necrosis) is a type of necrosis which results in a transformation of the tissue into a liquid viscous mass. [1] Often it is associated with focal bacterial or fungal infections, and can also manifest as one of the symptoms of an internal chemical burn . [ 2 ]