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California Seed and Plant Lab, Inc. provides high quality pathological and genetic testing to vegetable seed industry, fruit tree, grapevines and strawberry  industry by approved or in-house improved methods at competitive prices. We take pride in providing excellent customer service that includes quick turn around time, confidentiality and real-time status reporting of pending orders via secured web sessions.

Featured Test

Pseudomonas syringae pv phaseolicola - Halo blight on Beans

One of the most common and economically important diseases of Phaseolus beans (snap beans, dry beans, etc.) grown in the Midwest is halo blight, caused by Pseudomonas syringae pv. phaseolicola. Disease development is favored by cool wet weather. The pathogen survives the winter in infected seed or plant debris and is disseminated primarily by windblown rain. P. syringae pv. phaseolicola can also be spread during cultivation, particularly when leaf surfaces are wet. Like most other bacterial leafspot pathogens, P. syringae pv. phaseolicola is capable of surviving as epiphytic populations on the surface of healthy soybean leaves. When these pathogenic bacteria enter the leaves through wounds or natural openings like stomates they multiply rapidly and induce the formation of lesions. The lesions, which are watersoaked at first, soon become brown and dry and are usually surrounded by a yellow halo. When many lesions grow together, large areas of dead leaf tissue may develop. The halo is actually caused by a toxin that is produced by the bacteria within the lesion. As the toxin diffuses out into the leaf tissue it causes breakdown of chlorophyll and creates the halo. When toxin from infected leaves is translocated to the growing point of the shoot, the new leaves that develop are often stunted and chlorotic.