PREVALENCE OF SEED POTATO DISEASES IN DIFFERENT VARIETIES AVAILABLE IN MUNSHIGANJ DISTRICT OF BANGLADESH

Abstract

Diseases prevalence of 19 different seed potato varieties were assessed in farmer’s production land located in Munshiganj district of Bangladesh and laboratory works were conducted in the central laboratory during October 2020 to March 2021. The tested 19 varieties were collected from BADC and those were Prada, BARI Alu40,

Santana, BARI Alu-79, Innovator, Aluity, Diamant, Carollas, BARI Alu-41, BARI alu-35, BARI alu-37, Queen Anne, Granola, Asterix, Labella, Sunshine, Cardinal, Sagita, and Alkender. Data were collected on disease incidence, disease severity, plant growth, and yield contributing characteristics. Four significant diseases namely, early blight, late blight, PLRV and scab were identified. Causal agent Alternaria solani and Phytophthora infestanc were isolated from early blight and late blight infected leaves respectively. The highest early blight incidence (75%) was recorded in BARI Alu-79, Diamant and Santana, and the lowest incidence (55%) was recorded in Asterix and Sunshine after 75 DAS. The maximum severity (39%) was observed in Aluity and Prada while the lowest (24%) was observed in BARI Alu-40. The highest disease incidence (71.67%) of late blight was recorded in cardinal and Asterix while incidence was minimum (48.33%) in BARI Alu-41 and BARI Alu-79. The maximum severity (32.67%) was in Cardinal and the minimum (22.33%) was observed in BARI Alu-40. In PLRV, the highest incidence (85%) was in Labella and the lowest (23.33%) was in BARI Alu-79. The severity was the highest (34.33%) in Sagita with Labella and lowest (11%) was in BARI Alu-79. In common scab, the highest incidence (35.48%) and severity (17.85%) was observed in Diamant. However, the lowest incidence (5.52%) and severity (1.38%) were formed in Prada and Carollas variety. The highest frequency of grade C (<28mm) tuber (53.79%) was produced by Cardinal, B2 (28-44mm) tuber (57.78%) by BARI Alu-79, B1 (45-55mm) tuber (60.17%) by Innovator and A (>55mm) tuber (5.81%) by Aluity and BARI Alu-79. The counted number of tubers hill -1 was maximum (18.17%) in Cardinal and the lowest (5.63%) in Carollas followed by Aluity (5.74%), Prada (6.11%). The maximum weight (785.6 g) of tubers per hill was found to be in BARI Alu-40 followed by Sunshine (759.87 g). The lowest weight (287.05g) of tubers hill -1 was observed in BARI Alu79 followed by Diamant

(384.14g). Most significantly, BARI Alu-40 was found free of PLRV and scab while being less susceptible to early blight and late blight. This variety had greater tuber hill -1 count, high proportion of medium-sized tubers, produced maximum yield and better percentage of marketable seed tubers.