Dispersal of boll weevil toward and within the cotton plant and implications for insecticide exposure.

These findings suggest that weevils accessing the cotton plants exhibited within-plant distribution that minimizes their contact with insecticide residue on plant foliage. Furthermore, short residual control with malathion, the most used insecticide against boll weevil, and the low susceptibility exhibited by the tested population to pyrethroids highlight the current challenges faced for boll weevil control in Brazilian cotton fields. © 2020 Society of Chemical Industry.