Efficacy of insecticides against, Helicoverpa armigera (Hb.) on tomato
2000
Janwari, L.A.
An experiment on efficacy of insecticides against Heliothis armigera (HB.) was conducted in the field of Entomology Section, Agriculture Research Institute, and Tandojam during 1998. One and half month old seedlings of tomato variety Pomodor were planted in a four replicated randomized complete block design, each replication comprised of eleven row & of six meter long while row to row distance was 75cm. Seven insecticides, namely Karate, Ambush, Cymbush, Ripcard, Mavrik, Baythroid and Sherpa were mixed with water and sprayed on the crop with the help of hand operated Gloria sprayer. The pretreatment larval population counts were made one day before of each spray, whereas post treatment population counts were made after 24, 48, 72 hours, and one and two weeks after treatment. It was found that all the insecticides provided significantly effective in controlling fruit worm of tomato in both the sprays. Among various insecticides tested Karate (2.5 EC) and Bathroid (5 EC) were more effective in controlling tomato fruit borer in both the sprays. However, Ripcard (10 EC), Ambush (10 EC), Cymbush (5 EC), Mavrik (2 EC), and Sherpa (5 EC) were also found to be effective. The results were statistically highly significant. The pattern of insecticides after 24, 48, 72 hours and one and two weeks of spray remained more or less same. On over all basis Karate and Baythroid found to be superior to all the insecticides under trial in controlling the pest. Besides that, it was observed that the insecticides showed a gradual decline in their effect (less reduction in the pest population) one week after the treatment and onward.
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