494 



Pests collected on Citrus include a hitherto unreported Aleurodid 

 closely resembling Aleurodes citri, with which it may prove to be 

 identical. 



Ball (E. D.) & Fracker (S. B.). Division of Entomology.— Bienn. 

 Rept. Wisconsin Dept. Agric. 1917-1918, Madison, Bull. 20, 31st 

 December 1918, pp. 37-39 & 60-66. [Received 15th September 

 1919.] 



The most serious pest of the year, the poplar weevil, CryptorrhjncJms 

 lapathi, was successfully controlled by the application of " carbolineum 

 Avenarius " which is sold imder the name of Protexol. The variety 

 known as " Vogel's poplar " is still apparently immune to atttacks 

 by this pest. 



The pests intercepted during the years under review included : 

 Aphids on Viburnum ; Asjndiotus rapax (greedy scale) on apple from 

 France ; Gracilaria zaclirysa, Meyr., on Azalea ; an egg-mass of 

 Malacosoma sp. (tent caterpillar) on Crataegus ; and eggs and cocoons 

 of Orgijia (Notolophus) antiqua (vapourer moth) on Spiraea and Azalea. 



The use of lime-sulphur against the San Jose scale has been aban- 

 doned, especially in towTis and near houses, in favour of a mixture of 

 1 U.S. gal. of best miscible oil to 12 U.S. gals, of water. This mixture 

 appears to be completely effective and does not discolour white paint 

 like lime-sulphur. 



Parrott (P. J.), HoDGKiss (H. E.) & Hartzell (F. Z.). The Rosy 

 Aphis in relation to abnormal Apple Structures. — New York 

 Agric. Expt. Sta., Geneva, Tech. Bull. 66, January 1919, 29 pp., 

 8 plates, 6 figs. [Received 15th September 1919.] 



The effects of attacks by Aphis sorhi, Kalt. (rosy aphis) on the 

 development and conformation of apples are described in detail. 

 The eggs of this aphis hatch during the period of swelling and breaking 

 of the apple buds, and most of the nymphs have emerged by the time 

 that the tips of the leaves have projected as much as one-fourth to 

 half an inch from the ends of the more advanced buds. The nymphs 

 crawl down among the young, tender leaves as they unfold, generally 

 remaining about the leaves they first attack and not advancing to the 

 tips of the shoots, as many allied species of Aphids do. Just about 

 the time the pink colour begins to show in the unopened blossoms 

 the Aphids of the first generation begin to mature and give rise to the 

 second generation. At the time of dropping of the petals some 

 individuals of the second generation reach maturity and enter on a 

 period of reproductive activity. Although the first external evidences 

 of injiu-y are indicated by the curling of the leaves before blossoming, 

 the greatest injury occurs with the maturing of the second and appear- 

 ance of the third generation, when there is generally a marked invasion 

 of leaf and fruit clusters around the primary centres of infestation. 

 With the rapid multiplication of the insects the leaves that are most 

 heavily infested become discoloured and may drop to the ground, 

 while the vitality of the fruit spurs is weakened by loss of sap. The 

 efiect of a serious infestation is usually manifested by lower yields of 

 fruit and sometimes the trees do not regain their normal condition until 



