38 



THE liEPOET OE THE 



No. 36 



Length of Adult Life of Female: As shown in table No. 5, the adult females 

 lived from 6 to 33 days, with an average covering the six generations of 17.7 days. 

 TABLE No. 5 — Showing Egg Laying Period and Length of Adult Life of Female 





No. of 

 Pairs 



Egg Laying Period 



Leng 



th of 



Life 



Time of 

 Year 



Temperature 



Brood 



Min. 



Max. 



Aver. 1 



Mm. 



Max. 



Aver. 



Min. 



Max. 







days 



days 



days 



days 



days 



days 





1st 



6 



3 



13 



9 



8 



25 



18 



May 19th to 

 June 14th 



38 



90 



61 



2nd 



7 



4 



20 



12 



6 



25 



16 



June 15th to 

 July 14th 



48 



98 



74 



3rd 



7 



6 



24 



19 



19 



27 



23 



July 7th to 

 Aug. 6th 



52 



95 



77 



4th 



7 



12 



29 



19 



18 



33 



24 



July 26th to 

 Aug. 30th 



46 



92 



75 



5th 



7 



6 



17 



12 



10 



29 



18 



Aug. 19th to 

 Sept. 16th 



46 



92 



50 



6th 



8 



3 



9 



5 



7 



12 



9 



Sept. 14th to 

 Sept. 29th 



45 



80 



58 



Averaj 



;e througr 



lout season : 



12.5 





17.7 





(a) Tyipical Gueii plums from mite-infested trees compared with 

 (6) pJums from uninfested Gueii tree. (Reduced) 



Habits of Male and Length of Adult Life-. The males are active, and appear 

 to be engaged most of the time running nimbly over the leaf surface in search of 

 females. They are occasionally found attending quiescent female deutonymphs. 



In mating, the male crawls under the female, extends his genital parts up- 

 ward and curving slightly forward engages with the female. Several males may 

 gather around a female, and each may in turn mate with her. 



The male is short-lived. In our studies, the average length of life was 

 3 days, the maximum 5 days and the minimum 2 days. 



