Effect of Cyantraniliprole on Feeding Cessation of Q Biotype Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae)

Abstract

The whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae) is one of the most devastating agricultural pests in many cropping systems worldwide. Growers rely on the use of insecticides to control this pest. However, some insecticides do not reduce the feeding of B. tabaci fast enough to prevent the direct and indirect damage produced by this insect. The effect of a new insecticide, cyantraniliprole 10OD (Cyazypyr™), on the feeding of B. tabaci adults, was studied under laboratory conditions. Cyantraniliprole 10OD is an insecticide that belongs to the IRAC Group 28 with a new mode of action for sucking insects, which provides rapid feeding cessation by impairing muscle function, resulting in reduced transmission of important insect vectored crop diseases. Laboratory experiments were conducted to determine the effect of cyantraniliprole along with some other commercially available insecticides on the feeding of B. tabaci adults by measuring the excretion of honeydew as an indirect assessment of insect feeding. In these experiments, cyantraniliprole resulted in significantly higher reduction of honeydew excretion (64.0%) by Q biotype B. tabaci adults during the first 30 minutes of exposure than diafenthiuron, triazophos, acetamiprid and spiromesifen, with all treatments having no adult mortality. Observations between 1 and 48 hours after exposure indicated that cyantraniliprole had numerically higher or similar reduction in honeydew production as the other insecticides, but by 48 hours (mid and high rate) and 96 hours (high rate) of exposure, cyantraniliprole had significantly higher reduction of honeydew excretion than all other insecticides tested. Low adult mortality was observed during first 24 hours of exposure in all treatments. Cyantraniliprole resulted in numerical or significantly higher adult mortality than all other treatments at the later observation intervals (72 -96 hours). The higher reduction in honeydew excretion by cyantraniliprole appeared to be related to faster feeding cessation during the initial hours of exposure by a combination of feeding cessation and direct mortality as the exposure time R. S. Rattan et al. 57increased. These findings document significant effects of cyantraniliprole on feeding cessation in Bemisia tabaci.

Effects of foliar and systemic insecticides on whitefly transmission and incidence ofCucurbit yellow stunting disorder virus

“…For example, imidacloprid has been shown to have anti‐feedant effects on B. tabaci that contribute to a reduction of various vectored plant viruses . Similarly, there is much evidence in support of the disruptive effect that cyantraniliprole has on feeding by various insect vectors . In the case of imidacloprid, the possibility exists that resistance to both lethal and sublethal effects has developed after 22 years of intensive use in vegetable crops and melons of the Southwest.…”

“…By altering behavioral responses of vector insects to their host plants, host plant resistance could alter the dynamics of disease transmission. Perhaps the altered probing and cessation of feeding that has been reported in various studies could affect transmission probabilities for certain insecticides, especially if knockdown activity is limited and mortality rates are slow.…”