Translocation of chlorantraniliprole and cyantraniliprole applied to corn as seed treatment and foliar spraying to control Spodoptera frugiperda (Lepidoptera: Noctuidae)

Abstract

The translocation of chemical insecticides in corn plants could enhance the control of Spodoptera frugiperda, based on their application form. Chlorantraniliprole and cyantraniliprole were applied via seed treatment and foliar spray in corn (VE and V3) to characterize the systemic action of both molecules in leaves that appeared after application. Bioassays with S. frugiperda and chemical quantification in LC-MS/MS confirmed the absorption and upward translocation of chlorantraniliprole and cyantraniliprole by xylem to new leaves. Both insecticides caused the mortality of larvae up to stage V6 (57.5±9.5% for chlorantraniliprole and 40 ±8.1% for cyantraniliprole), indicating the translocation of insecticides into leaves of corn plants when applied via seed treatment. However, the translocation of chlorantraniliprole and cyantraniliprole from sprayed leaves to new leaves was not observed, regardless of the stage of application plus the next first, second and third stages. An increased dosage of cyantraniliprole did not influence on its translocation in plant tissues, however, it influenced on the present amount of active ingredient. The application of chlorantraniliprole and cyantraniliprole in seed treatment is an important alternative for integrated pest management. The absorption and redistribution capacity of chlorantraniliprole and cyantraniliprole throughout the plant confer a prolonged residual action with satisfactory control of S. frugiperda.

Population decline in a ground-nesting solitary squash bee (Eucera pruinosa) following exposure to a neonicotinoid insecticide treated crop (Cucurbita pepo)

“…It is notable that exposure to Coragen-treated crops (chlorantraniliprole) seemed to have little impact on hoary squash bee reproduction in our study. This might be because chlorantraniliprole does not translocate effectively from one leaf to another when it is applied foliarly 65 . However, exposure to chlorantraniliprole has also been reported to be less of a concern to bees than neonicotinoids for laboratory trials with honey bees, bumble bees, or stingless bees 66 – 69 , semi-field trials with bumble bees 70 , and from our probabilistic risk assessment based on putative field exposure for hoary squash bees 19 .…”

“…However, exposure to chlorantraniliprole has also been reported to be less of a concern to bees than neonicotinoids for laboratory trials with honey bees, bumble bees, or stingless bees 66 – 69 , semi-field trials with bumble bees 70 , and from our probabilistic risk assessment based on putative field exposure for hoary squash bees 19 . The low hazard to bees appears to be due to an insensitivity in non-Lepidopteran insects to the ryanodine target site for the insecticide 65 , 66 , 71 , 72 . As such, Coragen may offer a viable crop protection alternative for squash growers against insect pests that poses a lower risk to ground-nesting solitary bees than some other registered systemic insecticides.…”

Seed treatment for managing fall armyworm as a defoliator and cutworm on maize: plant protection, residuality, and the insect life history

“…octanol/water partition coefficient) and the soil characteristics (e.g. percentage of clay and organic matter) normally interact to determine the insecticide uptake and translocation 29,30 . The three seed treatments showed similar performance against insecticide‐susceptible L5 FAW, suggesting that the physicochemical properties of the potting soil and insecticides were compatible for their insecticidal action on the aboveground target.…”

“…For example, insecticide seed treatment (IST) may be appropriate in cropping systems in which beneficial conservation practices such as minimal tillage favor soil insects and other generalist insect pests 11,27,28 . Against an aboveground target, the insecticide via seed treatment must be absorbed, translocated by the plant, and ingested by the insect to interact with the biochemical target in an effective concentration 29,30 . Only a few systemic insecticides meet these conditions by having sufficiently high potency and suitable physicochemical properties, including water solubility and partition coefficients 30,31 …”

EFFECTIVENESS OF INSECTICIDES ROTATION WITH DIFFERENT MODES OF ACTION AGAINST OIL PALM BUNCH MOTH Tirathaba mundella (WALKER) (Lepidoptera, Pyralidae)

“…Chlorantraniliprole also demonstrates significant residual activity. It can travel via absorption and upward translocation by xylem to new leaves (Pes et al, 2020). This would allow chlorantraniliprole to linger on, released, and translocated to other parts of the plant as conditions in the plant change (Logan, 1974).…”