TRIAL OF SOME RESISTANT VARIETIES TO CASSAVA MOSAIC DISEASE IN HUE CITY

Abstract

A field study was conducted to evaluate 5 cassava varieties for growth performance, fresh root yield, starch content and resistance to Cassava mosaic disease (CMD) under the agro-ecological conditions of Hue city, Vietnam. A small-scale trial was arranged in a randomized complete block design with 4 replications during the spring season of 2022 at Huong Xuan ward. A subsequent large-scale trial, non-replicated and including a control variety, was conducted in the spring of 2023 at Huong Xuan (Huong Tra town) and Phong Hien (Phong Dien town). The research results showed variation in yield (31.35 - 50.84 t/ha), starch content (30.50 - 35.10%) and CMD resistance. Among them, the HN5 variety recorded the highest yield under small-scale conditions (50.84 t/ha) and maintained relatively high performance under large-scale conditions (34.35 t/ha), with a starch content of 30.50% and exhibited no CMD symptoms during the study period. The research recommends speeding up the procedure for self-declaration of circulation of HN5 variety in Hue city to soon expand it to serve production.