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Epidemiology and strategy for the control of halo blight of phaseolus beans


, : Epidemiology and strategy for the control of halo blight of phaseolus beans. Annals of Applied Biology 93(2): 167-172

A halo-blight [Pseudomonas phaseolicola] epidemic model based on the equation of Van der Plank (1963) is described. The model used to determine tolerance levels for seed infection and to compare the effectiveness of chemical control measures based on foliar sprays and seed treaments. Reduction of primary inoculum, derived from infected seed, by disease exclusion through seed testing, or by chemical seed treatment will give effective disease control under British conditions (i.e., with an expected apparent infection rate (r) of 0.15/infected plant per day). Under climatic conditions more favorable for the disease where higher r values would occur, control treatments directed against primary inoculum would be less effective. Under such conditions, chemical sprays, which have no effect on primary inoculum but cause a reduction in the rate of disease increase, would be more effective. The most effective disease control, would be a combination of treatments.


Accession: 005375821

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Related references

Taylor, J.D.; Phelps, K.; Dudley, C.L., 1979: Epidemiology and strategy for the control of halo-blight of beans. A halo-blight (Pseudomonas phaseolicola) epidemic model was used to determine tolerance levels for seed infection and to compare the effectiveness of chemical control measures based on foliar sprays and seed treatments. Reduction of primary inocul...

Coyne, D.P.; Schuster, M.L., 1972: Genetics of tolerance to halo blight, common blight, and bacterial wilt in beans (Phaseolus vulgaris L.). The inheritance of reactions to different races of Pseudomonas phaseolicola in various crosses is described. The reaction to Xanthomonas phaseoli in a cross involving GN1140 (early and susceptible) and GN Nebr. No.1 sel. 27 (late and tolerant) was...

Taylor, J.D.; Innes, N.L.; Dudley, C.L.; Griffiths, W.A., 1978: Sources and inheritance of resistance to halo blight of phaseolus beans. Forty-three accessions of P. vulgaris and 4 of P. coccineus were classified on the basis of the reaction of their primary leaves and pods to inoculation with races 1 and 2 of the pathogen Pseudomonas phaseolicola [P. syringae]. Four groups were re...

Innes N.L.; Conway J.; Taylor J.D., 1984: Resistance to halo blight in the cambridge accessions v 4604 and v 4058 of phaseolus beans. V4604, a Cambridge University accession of Phaseolus vulgaris, had a high degree of leaf resistance to race 1 of Pseudomonas phaseolicola and partial resistance to race 2. Genetic control of resistance to race 1 was by a major dominant gene which...

Ockendon, Dj, 1982: A new source of resistance to halo-blight (Pseudomonas phaseolicola) in runner beans (Phaseolus coccineus). Annual report of the Bean Improvement Cooperative5(25): 83

K.Rudolph, 1964: Analysis of proteins and enzymes of the interaction between Phaseolus vulgaris and Pseudomonas phaseolicola (halo blight of Beans). The changes induced in the proteins of bean leaves following infection were different in susceptible and resistant vars. New enzymes, apparently of bacterial origin, which also appeared included dehydrogenases, oxidases, acid phosphatase, and este...

Hirai, D.; Shirai, K.; Iida, S.; Shirai, S., 1998: Selection of resistant lines to halo blight of kidney beans (Phaseolus vulgaris L.) by field inoculation assay. In 1993, 8 cultivars of Phaseolus vulgaris were inoculated with Pseudomonas syringae pv. phaseolicola [P. savastanoi pv. phaseolicola] by soaking the seed in 3 inoculum concentrations. In most cultivars the level of inoculum had little effect on t...

Hale C.N.; Shanks J.C., 1983: The halo blight bacterium pseudomonas syringae pathovar phaseolicola inhibits nodulation of dwarf beans phaseolus vulgaris. Infection of dwarf bean (P. vulgaris) with a toxin-producing (Tox+) strain of the halo blight organism (P. syringae pv. phaseolicola) severely reduces nodulation by Rhizobium phaseoli, whereas infection with a toxin non-producing mutant does not....

Mastenbroek, C., 1955: Control of halo blight in beans. Halo blight, caused by Pseudomonas medicaginis, is an important economic disease of beans in the Netherlands. Fairly satisfactory control was obtained by roguing diseased plants and those surrounding them within a radius of 1-2 m. ; roguing diseas...

Hahne, H., 1942: Control of halo blight of beans. Halo disease of beans has lately become so widespread in Germany that the use of seed harvested from non-infected fields is impossible. The removal of obviously infected seed before sowing does not remove all infected seed. The removal of obviousl...