Effect of Imidacloprid on Incidence of Tomato yellow leaf curl virus

Abstract

Confidor, an imidacloprid insecticide, was used in two applications at four rates (47.6, 71.4, 95.2, and 119 g a.i./ha) for indirectly controlling Tomato yellow leaf curl virus (TYLCV) in field plantings of tomato. This spray regimen was compared with standard applications of cypermethrins at 10- to 15-day intervals throughout the growing season. In three field trials, a combination of integrated pest management (IPM) practices and two applications of Confidor at the two highest rates immediately after planting and 6 weeks later, protected tomato plants against the disease until 12 weeks after sowing. All rates of Confidor reduced disease incidence compared with standard chemical control applied in an integrated strategy, and quantitative efficacy increased with increase of insecticide rate. In the three seasons, the mean incidence of TYLCV 12 weeks after sowing was 42.7% in plots not adopting IPM compared with 15.7% in those that did. Disease incidence was reduced by Confidor treatments to 2.2 to 17%. Confidor-treated plots consistently had higher yields than control plots, and the yields decreased with the decrease in the rate of Confidor application. Confidor offers several advantages over standard applications of cypermethrins to control TYLCV. When applied immediately after planting, its long-lasting systemic activity protected the crop against the disease during early stages of growth. In addition, it reduced the number of sprays and increased tomato yield.

Management of Chilli Leaf Curl Virus Disease in the Coastal Zone of Odisha through Integrated Approach

“…Considering the cost of cultivation of different treatments, it is clearly indicated that T3 recorded the highest net return with highest B: C ratio though lowest disease incidence and white fly population/plant was recorded in T5. Our results well supported by observations of previous workers (Mullins et al, 1993, Ahmed et al, 2001and Cahill et al, 1996 and they recommended neonicotinoid group of insecticides (thiomethoxam, imidacloprid and dinotefuron) to reduce whitefly populations in order to save tomato plants against leaf curl virus diseases.…”

Bio-rational management of whitefly (Bemisia tabaci) for suppressing tomato yellow leaf curl virus

“…Admire was found to be effective in reducing TYLCV incidence and resulted yield increase. The results are in agreement with the findings of Savary (2000) and Ahmed et al (2001). Imidacloprid (a systemic chloronicotinyl insecticide, Admire) gained major importance for controlling Bemisia tabaci in both field and protected crops, in view of extensive resistance to Organophosphorous, Pyrethroid and Cyclodiene insecticides (Cahil et al, 1995).…”

Evaluation of Different Germplasm and Insecticides against Tomato Leaf Curl Virus Affecting Tomato

“…Efficacy of imidacloprid to check tomato leaf curl virus under field conditions was also reported by Ahmed et al, (2001), who found that the repeated sprays of imidacloprid reduced disease incidence and the treated plots consistently had higher yields than control plots. Curling and cupping, with some reduction in leaf size of plant.…”