APPENDIX I. 



HOW AND WHEN TO USE SPRAYING MACHINES. 



The Knapsack Spraying Machines which were purchased 

 at the instance of the Food Production Department of the 

 Board of Agriculture can be used for many purposes other 

 than the prevention of potato disease. In 1917 nearly 8,000 

 machines were supplied for the use of allotment-holders, 

 a,nd those who have charge of these machines would do well 

 ,to see that they are kept in good order so that they may be 

 available if required for use against any of the under- 

 mentioned pests and diseases. 



The numbers in brackets after the names of the diseases 

 denote the leaflets which are published by the Board of 

 Agriculture ; these leaflets may be obtained free of 

 charge and post free from the Board at 3, St. James' Square, 

 London, S.W. i. 



(i) APHIDES OR PLANT-LICE (104). 



Name of Pest. 



*Permanent apple aphis Apple. 

 *Blossom and stem 



apple aphis. 

 *Rosy apple aphis 

 *Cherry black fly 



Plant attacked. 



Remedies. 



(1) Nicotine and soap 

 ,, wash. 



(2) Soap and quassia 

 ,, wash, or 



Cherry and (3) Weak paraffin emul- 



*Currant blister-leaf 



aphis (68) . 

 *Currant leal and shoot 



aphis (68). 



* Peach aphis 

 *Pear aphis 

 *Leaf curling aphis 

 *Plum mealy aphis (104) 



* Hop-damson aphis (88) 



*Gooseberry aphis . 

 Bean aphis (104) . ,/ 



Cabbage aphis (TO4) . 

 Rose aphides (104). 



Peach. sion applied in the 



Currants early part of the year, 



and 



,, (4) Strong paraffin emul- 



sion applied in the 

 Peach autumn. See Appen- 



Pear dix II. 



Plums 



Damson and 



hops. 



Gooseberry 

 Beans, furze, 



etc. 



Cabbages, etc. 

 Roses. 



* Professor F. V. Theobald, of Wye, strongly recommends the 

 autumnal spraying for these pests. A strong paraffin wash may 

 be used after the fruit is picked, for it does not matter if the 

 leaves are damaged at that time of year. 



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