Phytophthora palmivora Pod Rot of Cacao in Papua New Guinea; Investigations 1962 -1971.

Abstract

New field infections of P. palmivora on pods were always present at Keravat in New Britain and no regular high or low incidence seasons occurred during 1962 to 1971. Incidence was over 20 per cent in 1955-56 but less than 3 per cent in 1962-65 and between 10 per cent and 20 per cent in 1969-71. Average annual rainfall for these three periods were 246, 277 and 289 mm respectively. No adequate records of rainfall type ( e.g., drizzle, squall) are available for the first two periods.