183 



of sodium fluoride. Fumigation with hydrocyanic acid is useful for 

 books, papers and other stored material. In the case of forest trees, 

 care should be taken that they do not become scarred near the base 

 and any cuts should be painted with coal tar. Clean cultivation should 

 be practised, and the ploughing under of old stubble in fields should be 

 discontinued. 



Jarvis (E.). Combating the Cane Beetle. — Queensland Agric. Jl., 

 Brisbane, v, no. 2, February 1916, pp. 102-103. 



During November, the rainfall was insufficient to produce soil 

 conditions suitable for the emergence of Lepidiota albohirta. Two 

 root-eating Scarabaeid beetles, Dasygnathus sp. and Anomala sp., 

 appeared in the cane fields in the middle of the month. The indis- 

 criminate felling of all trees, including the food-plants of L. albohirtu, 

 in the vicinity of an infested cane field, is not to be recommended in 

 all cases. The success of this method of procedure depends largely 

 on the geographical position of the infested area, as well as on the soil 

 conditions. From observations made at Gordonvale, it may be 

 inferred that in certain soils this beetle is unable to remain alive for 

 more than ten weeks during dry weather. 



Jack (R. W.). Rhodesian Citrus Pests. — Rhodesia Agric. JL, Salisbury, 

 xiii, no. 1, February 1916, pp. 69-83, 3 plates. 



Citrus trees in Rhodesia are but little injured by insect pests but 

 they may be attacked by the following : — Chrysomphalus aurantii 

 (red scale) which is distributed throughout southern Rhodesia, attack- 

 ing citrus trees of all sorts, especially lemon, orange and grape-fruit ; 

 naartje trees appear to suffer but little from this pest. C. aonidum 

 (circular purple scale) is not generally distributed as an outdoor pest 

 in Rhodesia, but, where it occurs, it appears to thrive quite as well as 

 €'. aurantii. Selenaspidus silvaticus (larger red scale) has been found 

 on the foliage of orange and lemon ; it is common on palms under 

 glass and was probably introduced by this agency. Up to now it 

 cannot be considered a pest of citrus. Lepidosaphes becJcii (purple or 

 mussel scale) occurs near Umtali, where it is only found on citrus. 

 Coccus hesperidum (brown or soft scale) is the most prevalent scale in 

 citrus orchards, and few are entirely free from it. Natural enemies 

 control it to some extent, including the caterpillars of a species of 

 Eublemma. Icerya purchasi (Australian bug) is kept from doing 

 serious damage by the imported Coccinelhd, Novius cardinalis, and by 

 Aulis foedata, a native species. The latter seems to be a very effective 

 check in Southern Rhodesia. 



Herrick (G. W.). The Need of a Broad, Liberal Training for an 

 Economic Entomologist.— J/. Econ. Entom. Concord, ix, no. 1, 

 February 1916, pp. 15-23. 



The author in his presidential address urges the necessity for a 

 thorough and extensive preparation on the part of those intending 

 to become economic entomologists. He points out the increasing 

 importance of economic entomology in the development of rural life, 

 and the need for complete knowledge of the theoretical and practical 

 aspects of the problems of applied entomology are clearly brought out. 



