Evaluation of Purple Sweetpotato Promising Clones Resistance to Scab (Sphaceloma batatas) Disease

¹ Research Center for Food Crops, Research Organization for Agriculture and Food, National Research and Innovation Agency (NRIA)
² BSIP Aneka Kacang

^1* Corresponding author: febr016@brin.go.id

Abstract

Scab disease is the main disease on sweetpotato, planting the resistance varieties to scab disease is an effective, easy, and inexpensive way. The research was carried out in Jambegede Experimental Station in January – April 2021. The material tested were 13 purple promising clones from the breeding section, four check varieties that are Antin 2, Antin 3, Papua Solossa and Ir, Melati. Inoculation of Sphaceloma batatas fungus (spore density 10⁴ spores/ml solution) were done when the plantation 14 days old, in the afternoon, by evenly applying spore suspension to the entire plant. The severity of scab disease is observed when the plants at 60 days old. The sample used were 10 tendrils per clone, the scab intensity was percentage of tendril area infected by scab. Besides, tuber characters such sweetpotatoes as marketable tuber weight, tuber shape, dry matter content, also morphological characters such as plant type, leaf shape, anatomy of leaves such as number of bone leaves, number of stomata and stomata density and the The degree of infection of scab disease were observed. The experiment’s result showed that eight sweetpotato promising clones was resistant, one clones were moderately resistant, four clones were moderately susceptible. Four clone recommended as new variety based on high productivity, good quality of tuber performance namely MSU 10001-15, MSU 10003-07, MSU 10010-43 and MSU 10018-40.