210 



Maine Agricultural Experiment Station. 1917. 



the jars with atomizers. The jars were kept out-of-doors in the 

 shade and were protected from the rain. The daily death rate 

 is indicated in table 17. 



TABLE 17. 



Daily Deatii Rate of Currant Fruit Flies Fed on Water andt 



Without Water. 



oa « ,9 



Adults 

 captured 

 in 

 field 



o 



o 



i-i 



O cj 



Daily Death Rate 



Adul 

 eonfli 

 after 

 emeri 



1 



2 



3 



4 



5 iDays 



49 

 28 

 21 



38 

 21 



28 



49 

 38 



28 

 21 



21 

 28 



6 

 3 

 2 

 2 

 5 

 9 



14 

 15 

 5 

 9 

 12 

 16 



17 

 18 

 15 

 5 

 4 

 3 



12 

 2 

 5 

 3 



1 

 2 



Flies 

 Flies 

 Flies 

 Flies 

 Flies 

 Flies 



It is evident that the currant fruit flies can not subsist on 

 -water alone. 



Inactiveness on Cold Days. 



It was observed in the field that currant fruit flies are so 

 numb on cold cloudy days that they are unable to take wing. 

 When disturbed on such days the trypetids would hop and then 

 drop to the ground. During the night of May 27, 1915,. the 

 minimum temperature registered 25° F., and during the next 

 two cold days (Table 9, May 28, 29) the adults were sluggish 

 and inactive. 



Adults Seek Shade. 



Currant fruit flies seek shady localities in the field. Large 

 numbers of specimens were captured in the shady parts of a 

 wood pile, beneath the scantlings of fences, on fence posts, on 

 trunks and branches of trees, and on branches of raspberry, 

 blackberry, currant and gooseberry bushes. It was frequently 

 observed that during the morning hours, the pest could be col-' 

 lected in certain shady places, and yet' when the hot sunshine 

 struck these same localities toward noon or afternoon, not a 

 single trypetid could be found. 



