83 



On the other hand, control by means of insect enemies, though the 

 discovery of such might entail considerable time and initial expenditure, 

 would, when once established, carry on the work with only very little 

 attention. Such enemies are the two Ichneumonids recorded in the 

 previous paper. Ichneumon sp. and Paniscus producius, of which the 

 former is by far the more important since it confines its attention to 

 the larvae of X. praejectata, and also destroys them before they are 

 half- developed and before much damage is done to the flax-leaf. This 

 parasite, which was reported from one area but thought to be absent 

 from a neighbouring one, has since been foimd to be present in both, 

 but in the latter it is subject to the attack of a secondary parasite. 

 P. productus on the other hand does not destroy the host-grub, but 

 eventually emerges from the pupa after the maximum amoimt of 

 damage has been done, and also, having several hosts, attacks only 

 a small percentage of the larvae of X. praefectaln. 



Davidson (J. H.). Passion- fruit Culture. — New Zealand Jl. Agric, 

 Wellington, xvii, no. 4, 21st October 1918, pp. 232-234. 



The chief insect enemies of the passion-vine {Passifora ediiUs) 

 in New Zealand are mealy bugs [Psendococcu^l and the vine hopper : 

 badly infested plants can only be dealt with by fumigation Avith 

 hydrocyanic gas. The plants, however, are not worth this expense 

 and it is better to uproot and burn them. 



Webster (E. L.). Common Garden Insects. — Iowa Agric. Expt. Sta., ^^ 

 Entom. Sect, Ames, Circ. no. 44, February 1918, 8 pp., 9 figs, p^ 

 [Received 30th December 1918.] 



Several of the commoner garden insects, with descriptions of the 

 methods recommended for their control, are dealt with, including :— 

 cutworms, Diabrotica vittata, F. (striped cucumber beetle), Pieris 

 rapae, L. (cabbage worm), Papaipema. nebris {nitela, Gn.) (stalk 

 borer), Leptinotarsa deeemlineata, Say (Colorado potato beetle), Mellitia 

 satyriniiormis, Hbn. (squash borer), blister beetles and grasshoppers. 



Keep Insecticides from Freezing. — Wkly. Press Bull. Pennsylvania 

 Dept. Agric, Harrisburg, iii, no. 49, 12th December 1918. 



It is important to protect lead arsenate in the form of paste from 

 both freezing and drying, as it then becomes so granular that it has to 

 be re-ground before it can be used successfully as an insecticide. The 

 powdered form is more convenient in this respect, as these precautions 

 are unnecessary in its case. When lime-sulphur freezes, there is a 

 change in it indicated by the deposition of a sediment and the presence 

 of crystals at the bottom of the barrel, and resulting in the waste of 

 the liquid. 



Deutrom (H. A.). Cultivation of the Robusta Types of Coffee. 

 Department of Agriculture, Ceylon, Leaflet no. 10. — Trop. Agri- 

 culturist, Peradeniya, li, no. 4, October 1918, pp. 218-224. 

 2 plates. 



The two chief insect enemies of the coffee plant in Ceylon are r 

 Coccus viridis, Gr. (green bug) on young stems and foliage, which <- 



