Septoria Leaf Blotch

Septoria Leaf Blotch

 

any one of a group of plant diseases caused by fungi of the genus Septoria and characterized by the formation, mainly on the leaves, of small, mostly rounded spots, which are dark at the periphery and light, sometimes almost white, in the center. Infected grain crops are distinguished by elongate blotches.

The most common and harmful are Septoria leaf blotch of grain crops (causative agents Septoria graminum, S. nodorum, and other species), tomato (S. lycopersici), and currants and gooseberries (S. ribis). Septoria leaf blotch also attacks millet (S. panici-miliacei), hemp (S. cannabis), soybeans (S. glycines), grapes (S. ampelina), and many other plants. The majority of the causative agents are preserved on plant remains. Distribution of spores and infection of plants occur in damp weather, when the pycnidia swell. With severe infection, the leaves and shoots become dry, and the stems turn brown, wrinkle, and often bend over. Premature leaf fall, necrosis of husks, and underdevelopment of grain (in cereals) are also observed.

Control measures include destroying plant remains, using crop rotation when cultivating annual crops, spraying plants with fungicides, growing resistant or less susceptible varieties, and applying a complete mineral fertilizer.

REFERENCE

Peresypkin, V. F. Sel’skokhoziaistvennaia fitopatologiia. Moscow, 1969.

M. I. DEMENT’EVA

References in periodicals archive ?
Typical symptoms of septoria leaf blotch appeared as chlorotic spots with the presence of small black dots that are pycnidia.
Various works on the synergistic effects between nitrogen fertilization, fungicide application and septoria leaf blotch on wheat yield were recently conducted [4,11].
This permit considering a new strategy against Septoria leaf blotch and minimizing the use of fungicides.
The Effect of Agronomic Practices on the Development of Septoria Leaf Blotch and its Subsequent Affect on the Yield and Yield Components of Wheat.
Infestation with Septoria leaf blotch and glume blotch was less severe on Grant than on Caldwell.