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Forages & Grains
Volume 62 Number 16 Date 08/17/2017 POTATO LEAFHOPPER - Surveys from August 10-16 found only non-economic populations. Counts were below 0.9 per sweep in all fields sampled and the average was 0.4 per sweep. Nymphs are no longer appearing in sweep net collections, and adult leafhoppers are the predominant development stage. PEA APHID - Counts remain very low. All alfalfa fields surveyed in the northwest and west-central counties contained fewer than one per sweep, which has been the case since populations collapsed in late June. ALFALFA CATERPILLAR - The adult butterfly stage of this insect is prevalent in fields across the southern and western areas of the state, suggesting an increase in larvae may occur by late August or early September. Severe alfalfa caterpillar damage is rare, but results when large numbers of female butterflies oviposit on recently cut alfalfa and the emerging larvae defoliate the regrowth. -- Krista Hamilton, DATCP Entomologist 
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