311 



from France were infested with Acronycta rumicis. L. (sorrel cutworm), 

 and from England, France and Holland with Emphytits ductus, L. 

 Cylas formicarins, F., was intercepted in sweet potatoes from Haiti, 

 while others, from Barbados, were infested with Eiiscepcs batatae, 

 Waterh. 



Wallace (F. N.) & others. Report of the Division of Entomology.— 



3rd Ann. Rept. Indiana Dept. Conservation, 1920-21, Indiana- 

 polis, 1922, pp. 37-57. 



Greenhouse pests included whitefly [Aleurodes], against which hydro- 

 cyanic acid gas has been successfully used, as has nicotine oleate, 

 which is prepared by mixing If pts. of commercial or technical oleic 

 acid or "red oil" with 2| pts. nicofume liquid, 1 fluid oz. of this 

 mixture being used to 2 U.S. gals, soft water. A brief account is 

 given of the greenhouse leaf-tyer [Pionea rubigalis], which may be 

 killed by fly switches and hght-traps. Plants subject to attack should 

 be sprayed on the lower.surface of the leaves with 1 oz. lead arsenate 

 to 1 U.S. gal. water, adding 1 oz. cheap laundry or fish-oil soap. 

 Spraying with 1 part Black-leaf 40 to 500 parts water, with 1 oz. fish-oil 

 soap to each U.S. gal. water, or with 1 fluid oz. nicotine oleate to 2 U.S. 

 gals, water is effective against chrysanthemum midge [Diarthronomyia 

 hypogaea]. Spraying should begin six to eight weeks before cuttings 

 are to be made and be done twice a week. Nicotine oleate will also 

 control mealy-bugs [Pseudococciis] and greenhouse orthezia [Orthezia 

 insignis]. 



Two new infestations of strawberry root worm [ Typophorus canellus] 

 were undoubtedly due to shipments of infested plants from the east. 

 The beetles hide by day and feed at night, chewing young leaves or 

 the bark of the new shoots. Arsenical sprays or dusts have not been 

 successful, as the adults will not eat treated foliage. Hand-picking 

 in the late afternoon and early morning has given fair results, the 

 best time being when the plants are breaking into growth after the 

 summer resting period. The removal of all soil from the benches of 

 infested greenhouses during this period is the most certain though 

 the most drastic method. In this case the walks should be treated 

 with a strong contact insecticide such as kerosene emulsion. The 

 larvae may be destroyed by removing about three inches of soil 

 from the benches in this period, and this treatment must be coupled 

 with hand-picking. 



Remedial measures recommended for rose midge [Neocerata 

 rhodophaga] include nightly fumigation with nicotine papers or tobacco 

 stems for two to three weeks, keeping the benches covered with J to 

 \ in. tobacco dust, which must be renewed as it becomes wet. Daily 

 picking of infested shoots and buds and burning them reduces infesta- 

 tion. 



During the end of September and beginning of October greenhouses 

 were invaded by cabbage looper [Phytometra brassicae], corn-ear 

 worm [Heliothis obsoleta] and the yellow-striped army worm [Prodenia 

 ornithogalli]. All these caterpillars show a decided preference for 

 the buds and flowers of plants, the chief damage being done to chry- 

 santhemums, roses, carnations and geraniums. Remedial measures 

 are spraying with 1 oz. lead arsenate, 1 oz. cheap laundry or fish-oil 

 soap and 1 U.S. gal. water. If objection is made to the white deposit 

 left by this spray, 1 pt. lead arsenate and 1 pt. cheap flour can be dusted 



