Weed Management is a Prerequisite for Using Neonicotinoid Insecticides – Turfgrass Science at Purdue University

Weed Management is a Prerequisite for Using Neonicotinoid Insecticides

Honey bees and other pollinators forage for nectar and pollen on a wide range of flowering plants, including some of our most common turfgrass weeds such as dandelion, white clover, ground ivy, speedwell, chickweed and a host of others.

If any of these flowering weeds are present at noticeable levels, it may be wise to avoid treating the area with a neonicotinoid (or any other insecticide). In the case of neonicotinoids (imidacloprid, clothianidin, thiamethoxam, dinotefuran), mowing off the flowers before application may not be enough since these insecticides are systemic and may be taken up by the plant and translocated to the flowers when another flush of growth occurs. Lawns that are relatively weed free should not pose a substantial risk to pollinators should a neonicotinoid be applied. Effective weed control should be a prerequisite for using neonicotinoid insecticides. We simply don’t know how much of the material ends up in the pollen and nectar of our most common weeds, but if there are no flowering weeds to take up the insecticide, the risk to pollinators will be significantly reduced. Always avoid spraying insecticide of any type directly onto plant blooms.

 

 
Doug Richmond, Turf Entomologist


Share This Article
Disclaimer: Reference to products is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in these articles assumes full responsibility for their use in accordance with current directions of the manufacturer.
Turfgrass Science at Purdue University - Horticulture & Landscape Architecture, 625 Agriculture Mall, West Lafayette, IN 47907

© 2020 Purdue University | An equal access/equal opportunity university | Copyright Complaints | Maintained by Turfgrass Science at Purdue University

If you have trouble accessing this page because of a disability, please contact Turfgrass Science at Purdue University at kkalbaug@purdue.edu.