283 



galleries. Cultivation and soil wdth a high nitrogen content have a 

 great effect in checking the increase of this borer and green manure 

 and lime dressings are therefore recommended. Erythrina, Albizzia, 

 Tephrosia, Crotalaria and Grevillea are all attacked by the borer. 



Jungle belts have been recommended between adjoining estates 

 [see this Review, Ser. A, v, p. 102]. The trees suitable for this purpose 

 are Acacia decurrens, for high elevations ; red gum, blue gum and 

 toona for medium elevations ; rubber and coconut for low elevations. 

 The undergro^vth should consist of jungle shrubs, mana-grass, etc. 

 A patana belt three quarters of a mile wide has been found to keep 

 one field isolated from another for several years. Belts of castor-oil 

 plants cannot be planted as traps, as they mature at various times and 

 the insects established in an early maturing plant on emergence would 

 be likely to fiv back to the tea. 



Henry (G. M.). Tea Tortrix {Homona coffearia, Nietn.). — Trop. Agric, 

 Peradeniya, xhaii, no. 3, March 1917, pp. 159-160. [Received 

 1st May 1917.] 



On hatching from the egg, which usually occurs in about six days, 

 the young larva of Homona coffearia wanders actively about for a 

 time and finally settles down, generally on the underside of a mature 

 leaf, spins a silken- covered way at the sides of the mid-rib and feeds 

 on the epidermis of the leaf. 



The usual method of combating this moth is the collection of the 

 egg-masses ; this method has been in use since 1903. Trappmg with 

 lamps has been tried, but without much success. Dead branches of 

 Grevillea with foliage were found to attract female moths when hung 

 on sticks just above the tea. Hessian bags were slipped over these 

 branches and the moths shaken from them into the bags. In this 

 way as many as 200 \^■ere taken from one branch, but there is no record 

 as to whether this method is an effective control. Male moths are 

 not attracted to the branches. H. coffearia is parasitised by several 

 species of Ichneumonids and Chalcids and a bacterial disease frequently 

 kills off large numbers. A minute Hymenopterous parasite has 

 recently been bred from the egg-masses and experiments are novr 

 being carried out to determine whether this egg-parasite occurs in 

 any numbers or can be successfully bred in captivity for distribution. 



Protection des Cultures contre les Parasites d'importation. [Protection 

 of Crops against imported Pests.] — Revue Hortic. de VAIgerie, 

 Algiers, xxi, no. 2, February 1917, pp. 25-29. (From Feuille 

 d' Informations du Ministere de I Agricultwe, October 1916). 

 [Received 1st May 1917.] 



The rapid increase in the amount of living plants imported from 

 one country to another has introduced a new danger, in that pests 

 of all sorts, particularly insects, are liable to be brought into a country 

 in which they have not previously existed, and to become acclimatised 

 there, fi'equently seeming to acquire a fresh stimulus to development, 

 either owing to the change of climate or to the fact that their natural 

 enemies do not exist in the new environment. Some of the classical 



