Transmission Characteristics of Bean Common Mosaic Virus (BCMV) in Yard Long Bean

Pole sitao also known as yard long bean is the most important and popular legume crop in the Philippines because of its nutritional benefits and the pods, young shoots as well as the beans are available throughout the year. However, yard long bean are commonly attack by pest and diseases which lessens the production and quality of harvest. BCMV is an important disease of beans worldwide that caused significant yield losses that can reach up to 80%. This study was conducted to determine the efficiency and symptom characteristics of the different BCMV transmission. The study was lay-outed using CRD, replicated three times with six treatments: T1-5 starved aphids, T2-10 starved aphids, T3-5 unstarved aphids, T4-10 unstarved aphids, T5-Mechanical Transmission, T6-Control. The plant height, number of leaves and symptom appearance were assessed for a period of 21 Days After Inoculation (DAI). Results showed significant differences among varied treatments on the plant height at 14 DAI and number of leaves at 21 DAI. Symptoms of BCMV inT5 showed vein banding, distortion, and decrease of leaf size and mosaic pattern 9 DAI, T2 and T4 showed vein banding, distortion, and reduction of leaf size 12 DAI, and same symptoms were observed in T1 and T3 at 15 DAI while T6 exhibited no symptoms of BCMV.