SUZUI, Takahito, KUEPRAKONE, Ubol and KAMPHANGRIDTHRONG, Thanawatt, 1979, Cross-inoculation of Phytophthora spp. isolated from some economic plants in Thailand
Tech. Bull., Trop. Agr. Res. Center, Japan No. 12
Cross-inoculation between the selected isolates of Phytophthora palmivora, P. nicotianae var. parasitica and P. botryosa, and durian, mandarin orange, pineapple, Hevea rubber, orchid and black pepper was performed. P. palmivora isolated from durian attacked durian, mandarin orange and Hevea rubber. P. palmivora from orchid ( Vanda) caused disease in durian, mandarin orange, Hevea rubber and orchid ( Vanda). P. nicotianae var. parasitica isolated from mandarin orange attacked all the test plants except black pepper, and the isolates from pineapple caused disease in every test. All the test plants used except black pepper were infected by inoculation of P. nicotianae var. parasitica from orchid (Ascocenda). P. botryosa obtained from Hevea rubber caused disease in durian, mandarin orange, Hevea rubber and orchid.
In the previous paper, the authors reported that Phytophthora palmivora, P. nicotianae var. parasitica and P. botryosa were isolated from some plants of economic importance in Thailand (Suzui et al. 1979) and demonstrated that the causal organism of Phytophthora disease of durian was limited to P. palmivora. But P. palmivora and P. nicotianae var. parasitica have a wide range of hosts in the world (Chee 1969, R. A. M. 1968). Therefore, cross-inoculation test was carried out between Phytophthora palmivora, P. nicotianae var. parasitica and P. botryosa and some plants of economic importance to clarify the host range of the pathogens and the behavior of Phytophthora in Thailand.