118 THE REPORT OF THE Xo. 36 



gallons of water were applied at an interval of five days. Later the plants were 

 again sprayed twice at double the above strength, buti even at this latter strength 

 control was not secured. In addition, too, the white deposit remaining from such 

 sprayings was difficult to remove even with forceful watering. 



Pyrethrum Insect Powder. Sprayings with fresh pyrethrum insect powder 

 in the strength of two and one-half ounces to five gallons of water were recom- 

 mended. In New Jersey' the following spray has proved successful:, 



Fresh pyrethrum insect powder 1 ounce. 



Common laundry soap i/^ ounce. 



Water 1 gallon. 



The soap should be dissolved in a small quantity of warm water after which 

 the insect powder and water should be added to make up one gallon of mixture* 

 One large fern grower applied such a spray once a week for five or six weeks. 

 The insect powder applied dry by means of a bellows also gave satisfactory results. 



The Chrysanthemum Midge^ Diarthronomijia liypoffoea H.Lw. 



In 1915" the Chrysanthemum Midge was found to be thoroughly established 

 in a large greenhouse at Ottawa. It had undoubtedly been introduced on some 

 chrysanthemum plants imported from the United States. In addition to the 

 Ottawa infestation we have recently received infested material from a florist in 

 Victoria, B.C. This latter outbreak occurred in the greenhouse of Mr. A. J. 

 Woodward, and tlie injury was first noticed in August, 1915, on chrysanthemums 

 growing outside as well as within the greenhouse. Although these two occurrences 

 are the only Canadian records we have, it would not, of course, be surprising to 

 learn of other greenhouses being infested. Felt' states that he has received the 

 insect from the States of Michigan, California, and' Oregon, and the same author 

 has recntly informed me^ that during the present year (1916) he also received 

 the species from the States of South Dakota, Washington and Delaware. The 

 pest is, therefore, widely distributed in North America. In referring to its 

 " Distribution and future probabilities " Felf says : " This species has been 

 recorded from central and southern Europe, and, as stated above, it has already 

 become established in several widely separated localities in this country, probably 

 by the shipment of infested plants or cuttings. It was very likely brought to 

 America without the normal quota, of parasites and for a time at least it may prove 

 to be a somewhat difficult insect to control, though it would seem as if the native 

 parasites of our large and varied gall midge fauna might in time prey most success- 

 fully upon this midge." 



Life-history. 



The Egg. 



The egg is small and in color pale orange ; in shape elongate-oval. It is des- 

 cribed by Felt as "Reddish-orange, length .15 mm., diameter .03 mm., the ex- 

 tremities narrowly rounded.'" 



On April 8, 1916, a female was enclosed with a small plant beneath a bell 

 jar. While under observation she was most active running about on the new leaves, 



'Weiss. H. B., Can. Ent., XLVIII, 141. 

 =46th Rep. Ent. Soc. Ont., 1915, 14. 

 =31st Rep. N.Y. State Entomologist, 51. 

 *In litt., 16 Oct., 1916. 

 '31st Rep. N.Y. State Entomologist, 54. 



