Effect of Light on Production of Oospores and Sporangia in Species of Phytophthora

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Abstract
The influence of light was studied on 19 isolates representing 10 Phytophthora spp. All the spp. were homothallic with the exception of P. capsici. A period of light was either required for or increased the number of sporangia formed by P. cactorum, P. heveae, P. himalayensis, and P. capsici. Conversely, total darkness favored the formation of sporangia by P. hibernalis and P. syringae. Low light intensity (3 ft.-C.) permitted sporangial formation by all of the above spp. Sporangia were not formed by P. erythroseptica, P. ilicis, P. megasperma, and P. sojae. Occasional oospores were formed by a few spp. in continuous light (700 ft.-c), whereas abundant oospores were formed in continuous darkness or reduced light intensity (3 ft-c.) by all the spp. tested except P. syringae.

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