THE LESSER APPLE WORM. 



49 



hatched between one hundred and six and one hundred and twenty- 

 four hours after deposition, the average being slightly more than five 

 days. 



The following table of group records taken from batches of eggs 

 deposited on sides of breeding cages and on apple foliage kept inside 

 of cages shows the approximate time of incubation: 



Table III. — Period of incubation of eggs of Enarmonia prunivora under normal out- 

 of-door conditions, Siloam Springs, Ark., 1908. 



Num- 

 ber of 

 eggs. 



Date de- 

 posited, 

 night of — 



Black spot appeared. 



Egg hatched. 



Time. 



7 



Aug. 28 

 Aug. 29 

 Sept. 6 

 Sept. 7 

 Sept. 9 

 Sept. 11 

 Sept. 12 



Sept. 13 

 Sept. 14 





September 3, a. m 



Days. 

 51 

 5 



51 

 5J 



3 

 1 



September 3, a. m 



September 4, a. m 



September 12, a. m 



5 





September 13, a. m 



11 

 11 



September 13, p. m 



September 15, a. m 



51 



51 



4§-51 



4J-51 

 51 



51 



35 





September 17, p. m 







September 19, a. m 



4 





6 



September 19, p. m 



September 20, a. m 









THE LARVA. 



The length of the larval period from time of hatching to leaving 

 fruit varied from thirteen to fifteen days during July, from twenty 

 to twenty-seven days in August and the first half of September, 

 and increased to from thirty to fifty days after the middle of Sep- 

 tember to early November. 



Individual records for over 100 larvae show a minimum of thirteen 

 days and a maximum of fifty days for actual time in fruit of normal 

 healthy larvae which left fruit prior to November 6. 



THE LARVA IN COCOON BEFORE PUPATING. 



This period varies greatly, according to where the larva is kept, 

 being much longer when confined with bits of paper, etc., in glasses. 

 From about 100 specimens allowed to spin cocoons in ends of apples, 

 either at the stem or blossom end, the average time during the months 

 of July and August was seven to eight days from leaving the fruit 

 to pupation, the minimum being one day and the maximum twelve 

 days. 



THE PUPA. 



The actual duration of the pupal stage varies from a minimum of 

 four (?) to a maximum of seventeen days, averaging about ten days. 

 Seventy-four per cent of all pupae observed in Arkansas developed 

 moths in between eight and twelve days. The records in Washington 

 agree very closely with those in Arkansas. 



