Pythium deliense, a pathogen causing yellowing and wilt of black pepper in India.
During the post-monsoon period of 2014 and onwards, black pepper (Piper nigrum) vines in all the major growing areas of Kerala and Karnataka (India), and especially in the districts of Idukki, Kasaragod, Kozhikode, Malappuram, Palakkad and Wayanad (Kerala) and Kodagu (Karnataka), turned yellow and later were found drying up. The causal pathogen was isolated and identified as Pythium deliense based on morphological, molecular and pathogenicity analyses. The obtained DNA sequences were deposited in GenBank (Accession Nos. MH017855, MH017856, MK416215, MK416216 and MN197462). This is thought to be the first report of P. deliense from the rhizosphere and roots of black pepper from India.