484 



Insect Pest and Quarantine Ordinance, No. 5 of 1901. — Extract from 

 Ceylon Govt, (inz., no. 6,801, 16th June 1916. [Received 20th 

 September 1916.] 



Under the terms of this Ordinance, any owner or person in charge of 

 land within the tea-growing area, as defined by the Director of Agri- 

 culture, shall eradicate and burn all plants of Ricinus communis, L. 

 (castor oil plant) growing on such land, unless permission be granted 

 by the Director. The latter shall have the right of providing for the 

 inspection of all lands within the tea-growing area. 



Matheson (R.). Apple Plant Lice and tlieir Control. — 8th Ann. Rept. 

 Quebec Soc. for the Protection of Plants from Insects and Fungous 

 Diseases, 1915-1916, Quebec, 1916, pp. 24-41, 5 plates. [Received 

 26th September 1916.] 



Overwintering eggs of Aphis avenae, F. (grain aphis) began to hatch 

 during 1915 in the latitude of Ithaca, N.Y., on 13th April, i.e., 

 before the apple buds were sho\\dng green. Stem-mothers matured 

 during the last week in April and the first week in May, when the 

 blossoms were showing pink, and continued to reproduce until 

 1st June, the maximum number produced by one individual being 

 seventy-five. Individuals of the second generation began to reach 

 maturity on 11th May and some acquired wings. All individuals 

 became mnged by the middle of June. Return to the apple took place 

 in September and October. Even in cases in which from 70 to 80 

 individuals were present on a single bud, the resultant distortion or 

 curling of the leaves was not marked. This species is not to be regarded 

 as a serious pest. 



Eggs of A. sorbi, Kalt., hatched between 22nd April and 3rd May, 

 when the buds were green. Members of this generation congregated on 

 opening flower buds and later on the flower stalks, on leaves surrounding 

 the flowers and on the flowers themselves. The reproductive period 

 of the stem-mothers lasted about 33 days, from 130 to 244 young being 

 produced. A large proportion of the second generation became winged. 

 This generation reached maturity at the end of May and the beginning 

 of June, and continued to reproduce throughout that month ; from 

 70 to 162 young were produced by one individual. The third generation 

 reached maturity between 10th and 15th June and gave rise to young 

 until the middle of July or later ; about 130 were produced by one 

 individual. All the descendants of the third generation became 

 wdnged. Four complete generations developed on the apple. 



Aphis pomi, de G., hatching from overwintering eggs appeared 

 between 21st April and 2nd May. Stem-mothers reaching maturity 

 between 11th and 14th May continued to reproduce for at least 30 days, 

 each individual giving rise to about 59 young. The second generation 

 became mature in from 12 to 14 days and was largely composed of 

 winged forms which spread the infestation throughout the orchard. 

 Reproduction continued rapidly throughout the summer. Sexual 

 forms appeared late in September, and after pairing, each female was 

 capable of depositing from two to six fertile eggs. 



