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The treatment of greenhouse infections of pseudomonas in cereals


, : The treatment of greenhouse infections of pseudomonas in cereals. Cereal Research Communications 15(2-3): 187-190

During the spring and early summer of 1985 the entire wheat and wheat-species planting in the greenhouse succumbed to a severe infection of P. syringae. Under normal conditions some 3,000 plants would be harvested while in that season seed were recovered from only 100 few and mainly shrivelled seed. The symptoms of the disease are first recognized in seedlings as a reduction in the reflectance of light from the leaf surfaces giving a characteristic water-spotted appearance. Small, paler areas can often be seen. As the infection progresses these paler areas become chlorotic and eventually necrotic. In particularly susceptible material (Triticum monococcum, T. umbellulatum and T. uniaristatum, for exmaple) death of the seedling will occur at the one- or two-leaf stage. The infection is seed borne with the bacteria being found in the intercellular spaces. Consequently, immersion of seed in surface-sterilizing agents does not remove the source of infection. Apparently, effectivity hinges on the pH of the potting compost. Pseudomonads, in general, have an optimum pH requirement of about 6.0 to 6.5. A detailed description of potting composts, fertilizers and growing conditions is included.

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