David Feltes, University of Illinois IPM Extension educator, Quad Cities Extension Center, reported on May 23 that potato leafhoppers had arrived in northern Illinois. Potato leafhoppers generally make their appearance in the state following the first cutting of alfalfa. These migratory insects do not overwinter in Illinois and instead are blown into Illinois fields on storm fronts from the south. As few as 0.2 leafhopper per sweep on alfalfa stubble may warrant a rescue treatment. Insecticides labeled for use against potato leafhoppers include (1) *Ambush (3.2 to 12.8 oz product per acre), (2) *Baythroid 2 (0.8 to 1.6 oz product per acre), (3) dimethoate (see label), (4) Imidan 70W (1 to 1-1/3 lb product per acre), (5) Lorsban 4E (1/2 to 1 pt product per acre), (6) *Penncap-M (2 to 3 pt product per acre), (7) *Pounce 3.2EC (4 to 8 oz product per acre), (8) Sevin XLR Plus (1 qt product per acre), and (9) *Warrior T (1.92 to 3.2 oz product per acre). Please consult the appropriate label for full instructions on product use. Those products preceded by an asterisk are restricted for use to certified applicators. We'll have much more to say about potato leafhoppers throughout the growing season.--Mike Gray |
Potato leafhopper adult.
Potato leafhoppers and injury (tip burn) to alfalfa leaf.