848 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



ascertain plants most suitable, the time at which they should be sown, 

 and the time at which they should be removed. The latter information 

 could, of course, be derived by a study of the complete life-history of the 

 pests. 



Various remedies have been suggested in the direction of applying to 

 the soil some substance which would prove harmful to the pests. We 

 think the most suitable substance to try at first is ordinary lime. This 

 substance is most commonly applied as a remedy for insect pests either 

 alone or mixed Avith common soot. Lime from gasworks might also be 

 employed. 



A certain quantity well incorporated with the soil around the plants 

 might have a most beneficial effect, and would probably benefit the crop 

 at the same time. It is, at any rate, a practical and inexpensive method. 

 Much has also been said concerning an application of nitrates, and many 

 misleading and inaccurate figures published regarding the percentage of 

 nitrates present in the soil. We do not deny that an application of 

 nitrogenous manure may have beneficial eft'ect, not as a direct remedy 

 against the pests, but merely as encouraging and stimulating the plant 

 and helping it, provided the numbers of nematodes are not too excessive, 

 to outgrow and overcome their attack. 



Experiments might also show if the worms in question or similar ones 

 are capable of attacking other and more important crops in the country. 

 Wheat and Onions are known to sutler occasionally from the attacks of 

 nematode worms belonging to the genus TylencJms, the Tylenchus of 

 the Onion causing great damage in Europe, and being found occasionally 

 in the crop of Upper Egypt. 



