Reports to the Board of AgricidtMre. i8i 



a quantity of liquid over trees or plants by means of an ordinary 

 syringe. In the so-called " washing or spraying," the insecticides are 

 sent out by means of special apparatus, which distribute the fluid in 

 a fine mist or spray. 



The caustic alkali wash could not well be applied with a brush, 

 and certainly not with a sponge. 



It might be applied with a garden syringe, but much of the 

 liquid would be wasted ; proper spraying machines should be used. 



Cankek Disease in Apple and Pear Trees. — The bark of apple 

 and pear, sent by a correspondent from Studingtou, near Cheltenham, 

 supposed to be insect damaged, shows no trace of any insect damage, 

 nor insects. 



It presented all the typical symptoms of Canker Fungus {Nectria 

 ditissima), described in certain stages in Leaflet No. 56. 



(The working of canker in varied ways is often taken to be insect 

 damage, but when the latter cause harm the pests can be easily 

 detected.) 



Thrips on Cucumbers. — A correspondent wrote asking for a' 

 remedy for Thrips in cucumbers. The following reply was sent : — 



Thrips on cucumbers may be destroyed in many ways. 



A common plan is simply to syringe with cold water. 



Quassia wash has been used with success and also fumigation 

 with tobacco. 



I think that the pyrethrum wash is best, however. 



The pyrethrum should be quite fresh, as it soon loses its strength. 



Celery Fly (Addia heradei). — The diseased Celery leaves sent 

 by the Crown Trading Company, Limited, from Cottenham, near 

 Cambridge, were found to be badly attacked by the Celery Fly 

 (^Acidia heradei). 



All necessary information is given in Leaflet No. 35. It has 

 been very harmful in many districts this season. 



Cabbage and Cauliflower Maggot. — Two enquiries concerning 

 the Cabbage Eoot Maggot have been received. A report on this 

 pest is given on p. 67. 



One correspondent sent some Centipedes with them and various 

 notes. 



There is of course no connection between the maggots and the 

 centipedes, but it is very probable the centipedes are preying upon 

 the srubs. 



