103 



The striped cucumber beetle [Diahrotica vittata] was effectively 

 controlled by dusting with dry lead arsenate. One tablespoon of dry 

 lead arsenate to 1 U.S. gal. water or 1 lb. to 50 U.S. gals, used as a 

 spray gave equally good results. The beetles should be collected 

 by hand in the morning in addition to the use of insecticides. The 

 melon aphis [Aphis gossypii] may be controlled by spraying with 

 nicotine sulphate, 1 pt. to 500 of water. The addition of soap increases 

 the action of the spray. 



The pests intercepted during the year included the brown-tail 

 moth [ Nygmia phaeorrhoea] from France. 



Hasemax (L.), Sullivan (K. C.) & McBride (0. C). [Entomological 

 Investigations, 1920-21.] — Missouri Agric. Expt. Sta., Columbia, 

 Bull. 189, October 1921, pp. 35-38, 1 fig. 



The various investigations undertaken from July 1920 to June 1921 

 by the Entomological Department are briefly outlined. 



The work in connection with codling moth [Cydia pomoneUa] and 

 Hessian fly [Mayetiola destructor] has been continued along the lines 

 adopted in previous years. Sprays at low to moderate pressure give 

 better results in codling moth control than at high pressure. Several 

 strengths of arsenicals have been tried against the striped cucumber 

 beetle [Diahrotica vittata], melon aphis [Aphis gossypii] squash stink 

 bug [Anasa tristis] and squash- vine borer [Melittia satyr inif or mis], 

 but although they appeared effective on patches in gardens they did 

 not control these pests in large commercial areas. 



The infestation of chinch bug [Blissus leucopterus] has been reduced 

 by systematic cleaning up and burning over waste places during the 

 winter. The San Jose scale [Aspidiotus perniciosus] is still the chief 

 pest of nursery stock and can apparently only be controlled by dipping 

 the stock in a solution of 1 gal. miscible oil to 12 or 15 gals, water. 

 This treatment reduced the scale by 99-100 per cent. 



Hase^ian (L.). The Tarnished Plant-bug and its Injury to Nursery 

 Stock. — Missouri Agric. Expt. Sta., Columbia, Res. Bull. 29, 

 July 1918, 26 pp., 9 figs. [Received 29th December 1921.] 



In Missouri nursery stock is considerably damaged by Lyguspratensis, 

 L. (tarnished plant-bug). Eggs are deposited in the blossoms of 

 various plants, preference being given to Erigeron canadensis. They 

 hatch in 7-10 days and pass through five nymphal stages, which are 

 fully described. The winter is passed in the adult stage, and those 

 that survive cause the worst damage by feeding on the opening 

 buds and growing tips of plants in the early spring. Any later injury 

 is of less importance. The date of appearance of the adults and the 

 plants attacked vary greatly each year. This pest is destructive to 

 various crops all the summer, but to nursery stock only during a few 

 weeks in spring. Peach, pear and cherry are the most severely 

 attacked. 



Clean culture is the chief remedial measure, as the bug does not 

 breed on the trees and crops that it damages. Weeds and other 

 plants on which it breeds and hibernates should be destroyed during 

 the end of the summer and early autumn. Trap crops, such as clover, 

 wheat, rye and grasses, planted in the nursery attract the pest in early 

 spring. Other effective measures are driving the bugs when they 

 are most numerous, and the use of a wheeled machine armed with 



