Co-Authors:
Kritzman, G., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Shani-Cahani, A., Lab. for Res. on Pest Mgmt. Applic., Inst. of Agricultural Engineering, Volcani Center, Bet Dagan 50250, Israel
Kirshner, B., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Riven, Y., Lab. for Res. on Pest Mgmt. Applic., Inst. of Agricultural Engineering, Volcani Center, Bet Dagan 50250, Israel
Bar, Z., Hevel Maon Enterprises, M.P. Negev 85465, Israel
Katan, J., Dept. of Plant Pathology, Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot 76100, Israel
Grinstein, A., Lab. for Res. on Pest Mgmt. Applic., Inst. of Agricultural Engineering, Volcani Center, Bet Dagan 50250, Israel
Abstract:
Peanut pod wart, a relatively new disease to peanut culture, was first reported in Israel in 1988 attacking peanut plants and causing dark warts on the pod. The causal agents are various Streptomyces spp. Scanning electron microscopy showed a significant difference between healthy and diseased tissues of the exocarp and mesocarp layers of the pod; there were no effects on the endocarp layer. The mesocarp cells of infected tissue were smaller and more compressed than those of healthy tissue. In most cases two cells under the peak of the wart were extremely large and the cells growing from them toward the surface were uneven, forming the shape of a fan. The pathogen could be isolated from the soil and rhizosphere, but in the pod it was found only in the warted tissue. The microorganisms isolated from the warts belong to different groups of Streptomyces spp.; subsequent pathogenicity tests proved their virulence to a limited host range. In potato, these isolates of Streptomyces spp. caused deep pitted scab; in peanuts they caused warts. Peanut seeds which developed in infected pods were free of the pathogen if the shell was undamaged. However, the pathogen is surface seedborne, and contaminated seeds during the mechanical cracking process.
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