5C4 



in detail — the principles being those indicated above. The benefits 

 supposed to be derived from rolling, or from the presence of lime in 

 the soil are probably due, not to any effect on the grubs, but to the 

 increased vigour of the grass itself. Clover or weeds with strong 

 tap-roots seem to be the most resistant of the pasture plants to attack. 



Regulations for the Control of Fire-Blight. — New Zealand J I. Agric, 

 Wellington, xxi, no. 1, 20th July 1920, p. 56. 



These regulations for the control of fire-blight {Bacillus amylovorus) 

 prohibit the removal of bees, and plants and parts of plants of apple, 

 pear, quince, or Crataegus from the North Auckland and Auckland 

 Land Districts, or from any nursery or orchard in which the disease 

 may be found by an inspector. 



Cockayne (A. H.). Report of the Biologist. — New Zealand Dept. 

 Agric, Indust., & Coynmerce, Ann. Rept. 1918-19, Wellington, 

 1919, pp. 40-42. [Received 27th September 1920.] 



The pear bud mite Perrisia (Contarinia) pyri and a leaf-hopper, 

 Empoasca sp., which have hitherto been more or less unknown in New 

 Zealand, proved extremely destructive during the year under review. 



GossAED (H. A.). Dust Spraying. Tests comparing Dusting with 

 Liquid Applications and Costs. — Mthlij. Bull Ohio Agric. Expt. 

 Sta., Wooster, v, no. 5, May 1920, pp. 147-153. [Received 28th 

 September 1920.] 



Particulars are given of tests with dusting applications carried out 

 in apple orchards at Wooster in the springs of 1916, 1917, and 1918. 

 The results indicate that dusting can take the place of one or two of 

 the sprays for codling moth [Cydia pomonella], and under some circum- 

 stances it is recommended. Dusting mixtures containing sulphur 

 and lead arsenate have given good control of Curculionids in the peach 

 orchai'ds of Virginia. 



GossARD (H. A.). Watch for Chinch Bugs. Method of Constructing 

 Dust and Tar Barriers in Farm Fields, — Mthly. Bull. Ohio Agric. 

 Expt. Sta., Wooster, v, no. 6, June 1920, pp. 178-179. [Received 

 27th September 1920.] 



The chinch bug [Blissus leucopterus] was abundant in some Ohio 

 districts in 1919, and, though a wet spring has been unfavourable to 

 it, precautions against it are advised. 



Barriers should be constructed to prevent the bugs migrating from 

 wheat stubble to maize fields immediately after harvest. These may 

 be either a line of creosote on a ploughed ridge with post-holes to trap 

 the insects as they turn back from the creosote on the top of the slope 

 [cf. R.A.E., A, V, 65], or a dust barrier, made by ploughing several 

 furrows round the wheat, and then dragging a log over the ploughed 

 area till a dusty trench is formed. Such a barrier is only effective 

 in dry weather. 



