186 Maine Agricultural Experiment Station. 1917. 



TABLE 3. 



Egg and Larval Periods Under Field Conditions. 





c 





s s 







d 



Kind of Prult 



ositio 



'2'« 



> 2 



J2 S'CI 



'^'2'S' 



Egg+larr 



periods 



(days) 





Date 



of 



Ovip 



^11 



Date 



issue 

 fruit 



p b w 





Gooseberry 



June 22 



7--8 



July 11 



1 



11—25 



1ft— 82 









12 



6 













13 



11 













14 



25 













15 



33 













16 



37 













17 



24 













18 



33 













19 



10 













20 



5 













21 



4 













22 



3 













24 



6 

 198 







Red currant 



June 25 



«— 7 



July 15 

 16 



2 

 4 



13-25 



20—31 













17 



6 













18 



12 













19 



17 













20 



4 













21 



3 













22 



2 













23 



2 













24 



1 













26 



1 

 54 







A total of 198 maggots issued from gooseberry drops and 

 of this number 178 completed the larval development in two to 

 three weeks, seven required 11-13 days and thirteen, 21-25 days. 

 Fifty-four maggots emerged from the red currant drops, of 

 which number 48 completed the larval period in two to three 

 weeks, two required 13 days and four, 21-25 days. 



Period Between Dropping of Fruit and Exit of Larvae. 



A method of control recommended is to frequently gather 

 and destroy fallen infested fruit. The length of time between 

 the dropping of the berries and the exit of the larvae has an 

 important bearing on the frequency of collecting drops. A daily 

 record was therefore kept of the gooseberries which dropped 

 from the bush and the dates of the exit of the larvae. The tg^ 

 chambers in gooseberries which dropped from June 27- July 1, 



