40 PEAS AND PEA CULTURE 



stroyed by their insect enemies, which include the 

 lady beetle, laced wing flies, and syrphus flies. 

 Johnson* reports experiments in planting peas in 

 rows, so that the cultivator and a brush can be used 

 to knock off the lice. By this method a man or boy 

 goes ahead of the cultivator with a pine switch and 

 brushes the vines vigorously, knocking off the lice, 

 and the cultivator follows and buries them. This 

 operation can be repeated every three days during 

 the height of the outbreak of the pea louse. 



Miscellaneous Insects. — Occasional references are 

 found in literature to damage through other insects 

 which sometimes attack peas. A myriapod belong- 

 ing to the species Blaniulus guttulatus has been 

 known to cause serious injury to peas as well as 

 beans. The attack is largely upon the seed in the 

 ground. A small mite (NotophaUus Haematopus) 

 is mentioned by MarchaP as causing considerable 

 injury to peas in central France. A four-spotted 

 pea weevil (Bruchus Gudri-maculatus ) is described 

 by Osborn and Alalley.^ Experiments were con- 

 ducted in treating seed with carbon bisulphide and 

 to note the possible effect upon the germination of 

 the seed. The seed containing larvae, pupae and 

 the newdy formed adults were not all destroyed by 

 the treatment. To be most effective they recom- 

 mend two or three applications about three or four 

 weeks apart. The germinating power of the seed 

 was not affected in any perceptible degree by the 

 fumes of the carbon. On the other hand Bolle^ says 



*E. S. R., Vol. 12. 



" E. S. R., Vol. 20. 



■ la. Exper. Sta., Bui. 32, p. 361. 



'E. S. R., Vol. 16. 



