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Forages & Grains
Volume 58 Number 4 Date 05/23/2013 ALFALFA WEEVIL - Larval populations are rapidly increasing in first growth alfalfa. Counts of 279-650 per 100 sweeps were found in a few Green and Lafayette County fields where defoliations levels ranged from 60-100%. Larval estimates at other sites in the south-central and southwestern areas were substantially lower and varied from 1-107 per 100 sweeps. Leaf tip damage associated with this insect is expected to become more pronounced by late May. Alfalfa fields should be checked regularly over the next 2-3 weeks for developing problems. Treatment is justified when the economic threshold of 40% tip feeding is exceeded 7-10 days in advance of harvest. TARNISHED PLANT BUG - Adults are more numerous than last week, but counts remain low. All surveyed fields in the southern and central counties had fewer than 6 per 100 sweeps. PEA APHID - Counts in alfalfa varied from 1-16 per 100 sweeps throughout the south, but averaged fewer than four per 100 sweeps. Reproduction has started. -- Krista Hamilton, DATCP Entomologist 
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