To Investigate the Efficacy of the Insecticide α-cypermethrin + teflubenzuron (Imunit® SC 15%) to Control of Helicoverpa armigera in Tomato Crops

Helicoverpa armigera is one of the key pests of tomato in Iran. To evaluate the efficacy of new insecticide α-cypermethrin + teflubenzuron (Imunit SC 15%) against this pest,  present research was carried out in a Randomized Complete Block Design with five treatments and four replications in three provinces  of Mazandaran, Qazvin and Fars in 2013 -14. The treatments were α-cypermethrin + teflubenzuron with two doses of 250 and 300 ml/ha, indoxacarb (Avant® SC 15%) with the dose of 250 ml/ha, chromafenozide (Matrik® SC 5%) with the dose of 2000 ml/ha and control (spraying water). At each sampling time, 10 plants from the middle of each plot were randomly selected. The number of larvae of tomato fruit worms, the number of healthy and damaged fruits and the number of infected and healthy fruits in each plot were determined and recorded at each harvest. Sampling was done 1 day before and 3, 7, and 14 days after the treatment The results showed that -  7 days after application, indoxacarb (250 ml/ha) and cypermethrin + teflubenzuron (300 ml/ha) with 78.13±6.96 % and 73.89±5.24% efficacy ranked first in the group in Mazandaran province. Indoxacarb (250ml/ha) and cypermethrin + teflubenzuron (300 ml/ha) with 88.71±7.89 % and 83.54±5.74% efficacy ranked first in the group in Ghazvin province. In Fars province indoxacarb (250 ml/ha) and cypermethrin + teflubenzuron (300 ml/ha) with 78.2±1.73 % and 71.40±1.81% efficacy ranked first in the group.  In all these locations, the number of infested fruits in all treatments were significantly different (α=1%) 14 days after treatments.