Studies on seasonal incidence of aphids infesting yard long bean

The field experiment was carried out at Vegetable Improvement Scheme, CES, Wakawali, Dist Ratnagiri to know the seasonal incidence of aphids on yard long bean Vigna unguiculata sub spp. sesquipedalis during Rabi 2023-24. The yard long bean variety, Konkan wali was found infested with aphids at various stages of crop growth and caused yield losses under field conditions. The population of aphids ranged between 3.01 to 58.12 aphids per leaf. The first incidence of aphids (16.83 aphids/leaf) was noticed in 49th SMW (04th - 10th December). In 8th SMW (19th February - 25th February) maximum population of aphids (58.12 aphids/leaf) was observed on the crop. Population of aphids in yard long bean gradually increased up to 8th SMW after that it gradually decreased till harvest of the crop. In 12th SMW (18th March 2024 -24th March 2024), minimum population of aphids (3.01 aphids/leaf) was recorded. The incidence of aphids was significant and negatively correlated with the minimum temperature and evening relative humidity, whereas bright sunshine hours showed a significant and positive correlation with population of aphids.