344 Pear and Cherry Sawfly. 



thoroughly that the trees looked as if they had been scorched 

 by fire. It is also well known in France and Germany. 



Methods of Prevention and Remedies. 



As it is clear that the chrysalides of this sawfly are in the 

 earth immediately under the fruit trees upon which the larvae 

 have been feeding, it is desirable to dig the ground all round 

 the trees in the early spring, and to hoe it with pronged hoes 

 so that the earth may be broken up finely. Quicklime should 

 then be put on and hoed in. In gardens, after the digging 

 and hoeing, it would be useful to beat down the earth in the 

 spring with a shovel in order to prevent the flies from coming 

 up. Kainit would be destructive to the larvae, as it is to those 

 of the Pear midge. It should be put under the trees in the 

 autumn in moderate quantity and evenly distributed. 



With regard to remedial measures, the larvae in the slimy 

 stage might be killed, or made to fall off the leaves, by dust- 

 ing them with lime. The lime must be quick and very finely 

 powdered, and can be distributed over the trees by means of 

 flour-scoops fastened to poles. The lime on the leaves would 

 also make them unpleasant for the larvae in their early stages, 

 and probably prevent the hatching of eggs. 



Spraying with paraffin emulsion would also be efficacious 

 if carefully done. This emulsion is made by dissolving half 

 a pound of soft soap in a gallon of boiling water, adding two 

 gallons of paraffin oil while the soap water is boiling, and 

 churning the mixture well together until the ingredients are 

 thoroughly incorporated and a creamy substance produced. 

 This should be diluted with 10 gallons of water and distri- 

 buted all over the infested leaves by means of a garden engine. 

 For large trees there are engines specially made, with strong 

 pumps, to force the emulsion all over the trees. A solution 

 of ?ott soap ana quassia is also efficacious, as it makes the 

 leaves bitter and unpleasant. This is made by adding the 

 extract of 6 or 7 lbs. of quassia chips to 7 lbs. ot soft soap, 

 dissolved in hot water, and diluted with 100 gallons of water. 

 The mixture should be well stirred, and distributed by means 

 of the engines described above. Paris green is the best re- 

 medy for these slugworms, as it poisons their food, but in 



