1056 EXPERIMENT STATION RECORD. 



Report on an exploration in Indo China relative to treatment of coffee 

 trees infested with, borers, L. Boutan {Bui. Ecoii. Indo-Vhinc, n. ser., 10 

 (1907), No. 06, pp. 631-661, figs. 15). — ^A thorough nivestigatioii was made of the 

 conditions which prevail in coffee plantations in Indo China, particularly with 

 reference to infestation with XyJotrcchus quadrupes and the means which have 

 been or may be adopted for the control of this pest. Of the various enemies 

 from which coffee may suffer four ai'e mentioned as most important in Indo 

 China. These include Hemileia I'astatn.r, Zcuzcra cojJe(r, XyJchorus fornlcatus, 

 and Xylotrcchus quadrupes. The last named insect is the most serious pest of 

 coffee in Indo China. 



■ Previous experiments have indicated that coffee trees may be protected to' 

 some extent from the borer by wrapping the trunks with various kinds of fab- 

 rics, with clay soil alone, or with soil mixtures to which copper sulphate is 

 added. A further test of these methods showed that they are not reliable. 

 An attempt wan made by the author to destroy borers in coffee trees by inducing 

 the absorption of ammonia. This remedy gave negative results. Further experi- 

 ments showed that it was possible to destroy the borers inside the trunks of 

 coffee trees by reducing the temperature of the trunks for a few minutes to 

 0° C. This may be accomplished by ether spray or other refrigerating reme- 

 dies. Still more satisfactory results were obtained from an apparatus by 

 means of which the trunks could be heated to a temperature of from 60 to 

 65° C. 



The occurrence of Lymantria monacha in Galicia during the years 1891 

 to 1902, W. Skdlaczek (JiiJirb. Staats u. Fondsg. Vcrwalt., 6 {1D!)7), pp. 130- 

 152). — ^A historical account is given of the prevalence of the nun moth in cer- 

 tain parts of Galicia and of the success which attended efforts to control it. 

 Statistical data are presented regarding the extent of its infestation of forests. 



During some years the nun moth was destroyed to the extent of 75 per cent 

 by its natural enemies, particularly Ichneumon and Tachina flies. The para- 

 sites in question were UKJSt numerous in localities in which the trees had not 

 been bandaged with sticky substances. At times it was found necessary to 

 apply sticky bands about all trees in an infested neighborhood. This procedure, 

 however, is not entirely satisfactory. 



The problem of the nun moth, J. Friedrich {Ccntbl. Gesam. Forstw., 33 

 (1907), No. 12, pp. 493-500). — The author discusses the conditions under which 

 serious outbreaks of the nuii moth ordinarily occur. The collection and de- 

 struction of the eggs of this moth is recognized as an efficient means of con- 

 trol in so far as it is applicable, hut the eggs are laid in so many different situa- 

 tions that it is impossible to check the multiplication of the moth effectively by 

 this means. Better results are obtained by collecting and destroying the adult 

 moths. It is suggested that if as much attention were given to the nun moth 

 as to bark beetles the former would become of little economic importance. 



Homeniade miscible oils, C. L. Penny (Delaware 8ta. Bui. 79, pp. 1-34, 

 figs. 2). — The author has already reported the results of some of his experi- 

 ments in the pi'eparation of miscible oils, especially for use in controlling scale 

 insects (E. S. R., 18, p. 162; 19, p. 56). It has been determined that heavy oils 

 are required in winter for destroying scale insects. Rosin oil appears to be a 

 very valuable reagent for producing emulsion. A number of additional tests 

 wei"e made in the preparation of miscible oils without the addition of other 

 insecticides. Particular attention was given to the chemical problems involved 

 in making combined insecticides and fungicides containing miscible oil and Bor- 

 deaux mixture, copper hydroxid, copper oleate, and other forms of copper. It 

 was found possible to make combinations of miscible oils with these copper 

 preparations, the cheapest mixture thus obtained being a combination of miscible 



