16 REPORT ON INJURIOUS INSECTS FOR 1906. 



recently as March last, stated : " So far, we know nothing- that will 

 destroy them [the eggs], and it is extremely doubtful if anything will 

 be found which will not at the same time harm the shoots." 



I. "This orchard was in a very dirty state . . . where I used 

 the [caustic soda-] emulsion I find hardly any insect life at all, and 

 practically no caterpillars." (Hereford.) 



2. " The only sprayfluid that has ever touched the Apple Psylla 

 e g s - O ur orchards are wonderfully free this year." (Worcester.) 



3. " I consider your petroleum caustic soda recipe a splendid 

 one for a winter dressing, being a great check upon destructive insects." 

 (Gloucester.) 



FIG. i. THE APPLE SUCKER (Psylla mali). 



i. Larva, natural size. la. Larva after third moult, much magnified. 

 2. Perfect insect, natural size. 2<*. The same, much magnified. 



4. " We should like to inform you that the caustic soda-emulsion 

 recommended by you last autumn, and which we sprayed with in 

 February, has wrought a wonderful change on our fruit trees. Last 

 year we had Apple Sucker very badly, and Mussel Scale also, but so 

 far this year our trees seem clear of both these pests. It has also taken 

 off the moss, etc., and with it probably many other pests." (Worcester.) 

 5. "Your wash was very effective." (Hereford.) 

 6. " Last year my Apples and Currants were ruined by the Psylla 

 and Currant Aphis. They were sprayed once with your caustic soda- 

 emulsion, and this year they look wonderfully well and entirely free 



