226 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 15 



of sweet com sown April 25th. Others doubtless returned to the com 

 plants. Considerable feeding was done in the larger weeds, the pigweeds, 

 the lamb's quarters and barnyard grass breaking over in a high per- 

 centage of cases. The barnyard grass was as high as 88% infested and 

 in one instance a plant with 26 stems was found to contain 17 larvae. 

 The weeds infested in this field in the order of frequency were: barn- 

 yard grass {Echinochloa crus-galli, Beauv.), redroot pigweed (Amaran- 

 thus retroflexus L.), yellow fox -tail (Setaria glauca Beauv.), lamb's 

 quarters (Chenopodium album L.), tumble weed or Russian thistle 

 (Sal-sola var. tenuifolia, G. F. W. Mey), green fox-tail {Setaria viridis 

 Beauv.), lady's thumb {Polygonum persicaria L.), wild buckwheat 

 {Polygonum convolvulus L.), ground cherry {Physalis heterophyllaNees) ; 

 other weeds present but not infested were : purslane, Canada thistle, 

 bitter sweet, milkweed and crab grass. However, throughout the 

 district of the weeds found to be infested in additon to the above the 

 following can be listed: orchard grass {Dactylis glomerata L.), Canada 

 thistle {Cirsium arvense Scop.), wild sunflower {Helianthus sp.), blue 

 weed or viper's bugloss {Echium vulgar e L.), ragweed {Ambrosia artemisii- 

 folia L.); mullein {Verbascum thapsus L.), goldenrod {Solidago sp.), 

 old witchgrass {Panicum capillare h.), yarrow {Achillea millefolium L.), 

 burdock {Arctium minus Bernh.) 



In cultivated crops and flowers larvae have been secured in the field 

 feeding in dahlia, geranium, aster, golden glow, beets, mangolds, toma- 

 toes (fruit), beans, oats, squash vines, broom com, Sudan grass, early 

 amber sugar cane, Hungarian grass and Mann's Wonder sorghum. 



No success was achieved in establishing larvae upon a long series of 

 common weeds by attaching eggs laid upon a slip of com leaf. The 

 eggs hatched but the larvae rarely were able to infest the plant. In 

 a series of experiments with paired adults caged over 35 common cul- 

 tivated vegetables and flowers, the larvae in very small numbers estab- 

 lished themselves upon mangolds, potatoes, celery, cauhflower, peas, 

 beans,peppers, eggplant, radish (gone to seed) , salvia and aster. Summing 

 up, however, the entire infestation in the open of plants other than com, 

 with the exception of the dahlias, possibly barnyard grass and Mann's 

 Wonder sorghum, was due entirely to the migrating larvae. These 

 larvae particularly in the weeds together with those in the com stalks, 

 stubble and refuse have gone into the winter in very large numbers with 

 every prospect of coming through successfully and giving rise to an 

 increased infestation in 1922. 



President Arthur Gibson: The next paper is by L. S. McLaine. 



