3G5 



Thayer (P.). Spray Formulas for the Town Lot. — Mihly. Bull. Ohio. 

 Agric. Expt. Sta., Wooster, i, no. 4, April 1916, pp. 114-116. 

 [Received 26th June 1916.] 



This paper describes the preparation of the more important sprays 

 in ordinary use in quantities sufficient for treating small numbers, 

 of affected plants. 



Smyth (E. G.). Report of the South Coast Laboratory. — 4th Rept. Bd. 

 Commissioners Agric. Porto Rico from 1st July 1914 to 30th June 

 1915, San Juan, 1916, pp. 45-50. [Received 27th June 1916.] 



The leaves of sugar-cane in San Domingo are eaten by the caterpillars 

 of Calisto archebates and serious damage has been done by it in that 

 island. To prevent the introduction of this and other pests of sugar- 

 cane, the holds of the cane-carrying boats are fumigated with sulphur 

 when leaving the port of La Romana and each boat-load is inspected 

 on arrival at Porto Rico and infested material destroyed. All fruits 

 and plants brought by passengers from San Domingo are similarly 

 inspected and a number of pests, chiefly scale-insects and whiteflies,. 

 have been intercepted in this way. 



Investigations on white grubs which attack sugar-cane were carried 

 out during the year. The life-histories of the following species known 

 to injure sugar-cane in Porto Rico were determined : — Lachnosterna 

 grandis, L. media, L. pequena, Ligyrus tiimuhsus, Strategus titanus,. 

 S. quadrifoveatus , Dyscinetus trachypygus and D. barbatus. L. grandis 

 and L. media were found to vary on the north and south sides of the 

 island. In the north, the varieties of both species fed on Poinciana 

 regia, Casuarina eqiiesitifolia and Terminalia catappa ; in the south 

 L. grandis fed on the leaves of coconut and L. media on Acalypha sp. 

 and Citrus spp. Adults of L. media appeared at Santa Rita between 

 March and June, while L. grandis was present in both spring and 

 autumn. L. pequena was fomid from July to September on Amaran- 

 thus sp. and Panicum barbinode among the sugar-cane. S. titanus is. 

 an important boring pest, the life-cycle of which occupies more than 

 a year. S. quadrifoveatus was present on cane on two occasions. 

 Under experimental conditions, the larvae fed on cane stubble during 

 the first instar only, and afterwards preferred rotting wood. Larvae 

 of Ligyrus tumidosus occurred in stumps of cane which were beginning 

 to decay, and were rarely found in living stems. The complete life- 

 cycle occupied 110 days and there are probably three generations, 

 annually. D. trachypygus and D. barbatus have at least two genera- 

 tions each year ; the larvae were seen to feed on cane stubble, etc., 

 and did not attack the living plant. 



Merrill (G. B.). Report of the Tobacco Insect Investigations. — 



4th Rept. Bd. Commissioners Agric. Porto Rico from 1st July 1914 

 to 30th June 1915, San Juan, 1916, pp. 50-52. [Received 27th 

 June 1916.] 



Insect pests of tobacco in Porto Rico include the flea-beetles, Epitrix 

 fuscata, Duv., and E. parvula, F., Scapteriscus didactylus, Latr. (changa 

 or mole cricket) and Protoparce [Phlegethontius) sexta, Joh. (horn worm) ^ 



