538 



acres have been replanted with grafted vines, an area nearly four times 

 as great as that compulsorily uprooted. During the 26 years in question 

 the authorities have disbursed over ;{200,000 at par in fighting this pest. 



MuTCHLER (A. J.) & Weiss (H. B.). Wood-boring Beetles of the Genus 

 Agrilus knovm to occur in New Jersey. — New Jersey State Dept. 

 Agric, Bur. Statistics & Inspection, Trenton, N.J., Circ. 48, 

 April 1922, 20 pp., 1 plate, 9 figs. 



A key to the species of the genus Agrihis is given, together with 

 brief accounts of twenty- two species that are likely to be found in New 

 Jersey nurseries. 



The more important are A. anxius, Gory (bronze birch borer) on 

 birch, poplars, cottonwoods and aspens; A. arcuatus, Say (oak twig- 

 girdler), reared from black oak {Quercus vehitina), beech {Fagus anieri- 

 cana) and hickory {Hicoria ovata) ; A. bilineatus, Web. (two-lined 

 chestnut borer) on oak and chestnut ; A, polittis, Say, on willow, 

 hazel, oak and other trees ; A . ruficoUis, F. (red-necked cane borer) on 

 blackberry and raspberry ; A . sinuatus, Oliv. (sinuate pear borer) in 

 sapwood of pear and Crataegus sp. ; A. siihcinctus, Gory, on poison ivy ; 

 A. viridis, L., var. fagi, Ratz. (rose stem-girdler), which occasionally 

 does considerable damage' to Rosa rugosa and standard roses ; and 

 A. vittaticollis, Rand, (apple root borer) on shadberry {Amelanchier 

 canadensis) , thorn, choke cherry, and Oxydendrum sp. The larvae of the 

 last named attack apple, pear, wild thorn, wild crab and service tree. 

 They bore through the sap and heartwood of the roots and lower part 

 of the trunk of apple, the burrows extending outward for several feet, 

 and may live in the tree for nearly two years. 



MozNETTE (G. F.). Insects injurious to the Mango in Florida and how 

 to combat them. — U.S. Dept. Agric, Washington, B.C., Farmers' 

 Bull. 1257, February 1922, 22 pp., 11 figs. [Received 28th August 

 1922.] 



Brief descriptions are given of the principal pests of mango in Florida, 

 with their life-histories and remedial measures for them. The mite, 

 Tetranychus y other si, McG., feeds on the upper surface of the leaves 

 in the dry, winter months, particularly between November and March. 

 When the mites are present in considerable numbers and the foliage is 

 still green, sulphur dust or lime-sulphur solution at the rate- of 1 gal. 

 of the concentrate to 60 gals, water should be applied. With lime- 

 sulphur solution, 1 gal. of the concentrate to 75 gals, water is advisable 

 during winter if the temperature is above the normal and if the trees 

 do not attain a thoroughly dormant condition. Heliothrips nihrocinctus , 

 Giard (red-banded thrips) feeds on the lower surfaces of the leaves. In 

 Florida the life-cycle is greatly influenced by temperature conditions. 

 During the late summer and autumn the life-cycle requires 25 days as a 

 minimum, and in January and February 35 days. There may be 10-12 

 generations a year. The lower surfaces ol the leaves should be sprayed 

 before they turn brown with 1 part 40 per cent, nicotine sulphate to 

 900 parts water, adding fish-oil soap to the diluted mixture to 

 make it spread evenly. When T. yothersi is present at the same time 

 the nicotine sulphate may be added to the lime-sulphur spray, the 

 nicotine being used at the strengths given above, but the soap being 

 omitted. Chrysomphalus aonidum, L. (Florida red scale) infests both 

 the leaves and the fruit. Lencaspis indica, Marl, (mango scale) is found 



