AND OTIIKR TXJURIOUS INSECTS OF I907 AND I908. 1 45 



winged individuals which appear from time to time (hu'ing the sum- 

 mer. Fertile females and males appear in the fall, and eggs are laid as 

 above indicated. 



Remedies: Plant iiiiiiifcstcci I'iiics on ground kno^i'ii to be free of 

 the pest. Nez'er use plants from, an infested field. Do not use land 

 previously infested unJil it has Iain fallow for at least tn'o years, or 

 has been, planted for two years zcith some crop other than corn or cur- 

 cubits, since ants also attend lice on the roots of such plants. A pur- 

 chaser finding plants infested, as shown by the presence of an insect 

 in some stage on leaves or roots, should either refuse to accept thevH, 

 or should immerse them for from tz'.'o to three minutes in kerosenet 

 emulsion, one part to t-zvelve parts of n'ater, zuashing them thoroughly 

 afterzvards zcith pure zvater'. Dipping them in tobacco solution zmlli 

 also kill the lice. 



If any Minnesota grower finds his plants dying oiT, or producing 

 poorlv, and notes an abundance of ants in the field, it would be well for 

 him to examine the roots of some of the plants, and if lice are found 

 thereon, to communicate with the Entomologist at the Experiment 

 Station. 



These lice do not apparently occur on other plants, according to 

 Professor Sanderson, who has done considerable work with them. 

 Mr. Larson sent us weeds in September, which were growing next to 

 his strawberries, loaded with lice which he supposed were the same 

 species, but which proved to be Aphis rinnicis and in no way threat- 

 ening the vines. 

 10 



