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Sunflower Insect Update (08/15/19)

According to the most recent IPM Crop Survey, sunflowers were in the R3 to R5.6 crop stages in ND.

According to the most recent IPM Crop Survey, sunflowers were in the R3 to R5.6 crop stages in ND. Early flowering is the most important time to scout fields for economic populations of seed-feeding insect pests including sunflower moth, banded / Arthur’s sunflower moth and red sunflower seed weevil. Continue to scout fields for insect pests until sunflowers reach R5.8 to R6.

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Insect trapping for sunflower moth indicates that high numbers of moths migrated into ND during the last two weeks, just in time for female moths to lay eggs on the face of the sunflower. High trap catches are present in the central and north central areas of ND. See past Crop & Pest Report (Issue 12) article on scouting and E.T. for sunflower moths.

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Banded sunflower moth trap catches peaked last week in most areas of ND with the highest trap catch at Renville County followed by Cass and Cavalier Counties. Trap catches for Arthuri sunflower moths are high in the northern tier of ND, but are usually lower numbers than the banded sunflower moth. See past Crop & Pest Report (Issue 12) article on scouting and E. T. for banded / Arthuri sunflower moths.

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Economic populations of red sunflower seed weevils are being observed in the earliest blooming sunflower fields, especially in field edges. The ⅛ inch long reddish-orange weevils are especially abundant in the north central area of ND (see map). The last Crop & Pest Report (Issue 13) has an article on scouting and E.T. for the red sunflower seed weevil.

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Janet J. Knodel

Extension Entomologist

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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