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AVatsox (J. R.)- The Woolly Whitefly (Aleurofhrixus howardi) in 

 Florida Citrus Plantations. — Intemat Rev. Science & Practice 

 Agric, Mthhj. Bull. Agric. Intell. & PI. Dis., Rome, vii, no. 7, 

 July 1916, pp. 1062-1063. [Abstract from Univ. Florida, Agric. 

 Expt. Sta., Tallahassee, Bull. no. 126, 1915, pp. 81-102.] i;Received 

 30th November 1916.J 



In 1909, Aleurodes {Aleurothrixus) howardi. Quaint, (woolly whitefly) 

 "was discovered for the first time in Florida near Tampa, having been 

 probably imported from Cuba. By 1914 it had spread over five 

 -counties and will soon be common in all the citrus plantations of 

 Florida. Injury is caused by the sucking of the juices until the plant 

 withers, by the secretion of a honeydew on the leaves and fruits which 

 forms a good medium for the growth of Meliola camelliae and other 

 fungi, and by the attraction which the whitefly colonies have for 

 Lepidosaphes beckii (purple scale). Both Aschersonia aleurodis (red 

 fungus) and Aegerita ivehheri (brown fungus) grow badly on A. howardi 

 and cannot prevent its spread. On some dead larvae a species of 

 Cladosporium was found which is beheved by the author to have been 

 the cause of death. A Chalcid, Eretmocerus haldemani, is the most 

 effective natural enemy. Good results in artificial control are obtained 

 by applying oily mixtures in the early days of March, the first half of 

 June, about mid- August, and early in November, when the insects are 

 in the early stages and more sensitive to insecticidal action. The 

 formula advised consists of 8 lb. whale-oil soap and 2 U.S. gals, of fine 

 paraffin oil, the mixture being vigorously stirred so that it is well 

 emulsified. One gallon of water is then added, stirring as above. This 

 emulsion must be diluted to make 200 gals, of spray solution. 



Watson (J. R.). Icerya purchasi in Florida, United States. — Internal. 

 Rev. Science & Practice Agric., Mthly. Bull. Agric. Intell. & PI. 

 Dis., Rome, vii, no. 7, July 1916, p. 1063. [Abstract from Univ. 

 Florida, Agric. Expt. Sta., Rept. for 1914, Tallahassee, 1916, 

 p. 55.] [Received 30th November 1916.] 



The spread of Icerya purchasi continues with increasing rapidity in 

 Florida. From August 1913 to March 1914 it was discovered in nine 

 locaUties. The damage has been very serious, especially at Key West, 

 where this scale even attacks Bursera simaruba, which must be added 

 to the list of host-plants. 



Baker (A. C.) & Turner (W. F.). Rosy Apple Aphis.— JL of Agric. 

 Research, Washington, B.C., vii, no. 7, November 1916, pp. 321- 

 343, 6 plates. 



The authors discuss at some length the nomenclature of the Aphid 

 kno\vn as the rosy apple aphis, and arrive at the conclusion that 

 Aphis malifoliae, Fitch, is the correct name for it. Aphis pyri, Boyer, 

 was the earliest name used for the American rosy aphis, but as the 

 original description does not apply to the insect under consideration, 

 this name cannot be used. Koch, in redescribing A. crataegi, Kalt., 

 as well as A. pyri, Boyer, based his descriptions entirely upon apple 

 forms, and these agree very closely with the authors' insect, so that 

 A. crataegi, Kalt., and A. pyri, Boyer, appear to be distinct species, 



(C.346) Wt. Pl/106. 1,500. 2.17. B.& F.Ltd. Gp.11/3. a 



