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Apterous (non-winged) lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Alate (winged) adult lettuce aphid (Nasonovia ribis-nigri). |
Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Large Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Large Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Large Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Large Lettuce aphid (Nasonovia ribis-nigri) nymph. |
Large Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
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Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymph on lettuce. |
Alate (winged) adult lettuce aphid (Nasonovia ribis-nigri) on lettuce. |
Alate (winged) adult lettuce aphid (Nasonovia ribis-nigri) on lettuce. |
Cabbage looper larva (Trichoplusia ni) and lettuce aphid nymph (Nasonovia ribis-nigri) on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymphs on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymphs on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymphs on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymphs on lettuce. |
Lettuce aphid (Nasonovia ribis-nigri) nymphs on lettuce. |
Small cabbage looper larva (Trichoplusia ni) on lettuce. |
Alate (winged) adult lettuce aphid (Nasonovia ribis-nigri) on lettuce. |
Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director Cooperative Extension, College of Agriculture and Life Sciences, The University of Arizona.
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