120 



THE REPORT OF THE 



No. 19 



The caterpillars of the Small White Cabbage Butterfly, Pontia rapoR, 

 L., were very troublesome in the Ottawa district during the past season, 

 and many market gardeners complained of their ravages. The remedy of 

 dusting the plants with pyrethrum insect powder, 1 lb. in 4 lbs, of cheap 

 flour, after the whole has been mixed together and kept in a tight jar '"or 

 24 hours, is so simple that it is most remarkable that the annual loss by this 

 insect is allowed to take place. 



The Codling Moth, Carpocapsa pomonella, L., was injuriously present 

 in many orchards in the district. A number of trees near the city were 

 examined on August 12th, and it was estimated that about 25% of the apples 

 on some of the trees were wormy. 



The work of the Pear-tree Slug, Eriocampa cerasi, Peck., (Fig. 32), 

 which does much harm to pears, cherries and plums, was noticed on plum 

 trees on August 25th. Many of these slimy, greenish-brown, slug-like, larvse 

 were present on the trees and had done very apparent injury to the foliage. 

 Specimens were found as late as October 5th feeding on the leaves. Spray- 

 ing with any of the recognized poisonous mixtures, or dusting the trees 

 at short intervals with freshly slaked lime, will destroy the larvse. 



Many householders complained of the ravages of the Clothes Moth. 

 This insect was certainly very abundant in Ottawa during the past summer 

 and did a great deal of damage to furs and woollen goods in houses. The 

 best remedies for these insects are of a preventive nature. All articles liable 

 to attack should be well shaken, brushed, and put away before the moths 

 appear in the spring. As the caterpillars feed only on substances of animal 

 origin, clothing, etc., to be protected may be wrapped tightly in linen^ 

 cotton or paper, and left in this way until required for autumn and winter 

 use. 



F»«. 31. Peridroma Saucia; a, moth; h, normal form of larva, lateral view; c, same in 

 curved position ; d, dark form, dorsal view ; e, egg from side ; /, egg mass on twig 

 (after Howard, Division of Entomology, U. S. Dept. Agriculture). 



Fig 32. Pear-tree slug. 



