Assessment of major diseases in commercial sweet sorghum varieties and development of management strategies

Date

2023

Abstract

Five commercial varieties/lines of sweet sorghum with good agronomic traits and sugar yield namely: ICSV700, ICSV93046, SPV422, NTJ2, and ICSR93034 were screened for resistance to bacterial stalk rot in the greenhouse of the National Crop Protection Cluster and under field conditions at the Central Experiment Station of UPLB [University of the Philippines Los Baños]. The bacterial isolates used in the greenhouse screening were highly virulent as shown in potato rot test and in pathogenicity test using one-month old sweet sorghum plant. Among the three inoculation methods tested, stem wounding and dropping of 0.1 ml inoculum suspension gave consistent stalk rot infection. Drenching of 10 ml homogenized bacterial suspension at the base of seedlings (without wounding) contained in plastic seedling bags and dropping of 1.0 ml bacterial suspension into the whorl of sweet sorghum resulted to poor stalk infection. Field evaluation studies showed low incidence of bacterial stalk rot during the dry season trial. In the wet season and ratoon crop trials, ICSV 700 and ICSV 93046 were resistant. Field evaluation of fungicides for its efficacy manage major fungal diseases of sweet sorghum (Sorghum bicolor (L.) Moench) was conducted for three trials (dry and wet season seed crop; and a ratoon crop) at the UPLB Central Experiment Station from November 2009 to February 2011. A sweet sorghum commercial variety NTJ2 was used in the trial. Seed-borne fungi from sweet sorghum were detected in disinfected and non-disinfected seeds. Nine fungal species distributed among Aspergillus, Penicillium, Curvularia, Fusarium, Bipolaris, Rhizopus, and Chaetomium were recorded. Sterile mycelia and four interesting coelomycetes seeds, species of Aspergillus are the most dominant followed by species of Curvularia, Penicillium and sterile mycelia. On the other hand, disinfected seeds revealed high presence of species of Curvularia followed by sterile mycelia, Fusarium, Aspergillus, Penicillium, coelomycete 2, coelomycete 1, Bipolaris and coelmycete 3.

Language

English

Document Type

Article

Pages /Collation

57 leaves

En – AGROVOC descriptors

SORGHUM BICOLOR; VARIETIES; PLANT DISEASES; FUNGICIDES; ROTS; CURVULARIA; FUSARIUM; BIPOLARIS; PENICILLIUM; RHIZOPUS; DISINFECTION; INOCULATION; PATHOGENICITY; MORBIDITY

This document is currently not available here.

Share

COinS