Resistance of guar Cyamopsis tetragonolоba (L.) Taub. to harmful organisms

Guar (clusterbean) Cyamopsis tetragonoloba (L.) Taub., a tropical annual legume crop of a multipurpose use, is promising for growing in the South Russia. The problem of resistance of guar to diseases and pests is discussed. The Alternaria leaf blight caused by Alternaria cyamopsidis Rangaswami & Rao and bacteria leaf blight caused by Xanthomonas axonopodis pv. cyamopsidis (Patel) Vauterin) are the most harmful diseases of guar. Seed infection promotes the extensive and fast spread of the disease. Anatomical and morphological characters are not having any relationship with A. cyamopsidis resistance in clusterbean plants. Sunshine, minimum temperature, cumulative rainfall and relative humidity in the evening were found significantly associated with Alternaria leaf blight severity (M.S. Saharan et al., 2004). The resistance of guar to bacteria leaf blight is oligogenically controlled (P.S.K. Anil et al., 2012). For X. axonopodis pv. cyamopsidis a differential interaction with plant host genotypes is characteristic...