140 



HOP. 



treatment, has been found to prevent Eecl Spider attack quite 

 satisfactorily. — ('Gard. Cliron.,' 1845.) This plan acts by 

 poisoning and burying the " Eed Spider " in the walls, and 

 also by putting a band in the way of such as have been 

 wintering under stones and rubbish, so that they will not care 

 to cross to get at the tree ; other mixtures, as preferred by the 

 cultivator, might be similarly used. 



Clean and properly-pointed walls are a preventive of attack, 

 as is also ground so cultivated and attended to that there shall 

 be no neglected surface the mites can lurk in, or hiding-places 

 under stones, clods of earth, or rubbish beneath which they 

 can hybernate. An autumn dressing of gas-lime would be a 

 desirable application to neglected borders where there are in- 

 fested wall-fruit trees. 



If by means of experiment it should be found that there is 

 any fluid capable of dissolving the Eed Spider's webs without 

 at the same time injuring the leafage, we could thus, by 

 clearing off its breeding-grounds, probably get rid almost 

 entirely of the pest. 



Hop and Lime-tree Red Spider. 



Tctrantjclnis tiliarum, Miill. ; T. tdariut>, Claparede. 



This attack is just mentioned, as an outburst of a special 

 pest of this kind in special states of weather is of practical 

 interest. 



Eed Spicier of Lime-trees : web with eggs in dried state, and after being 

 moistened, all greatly magnified. 



Opinions differ as to whether the "Eed Spider" of the 

 Lime-tree is the common "Eed Spider," T. telarius, or a dis- 

 tinct species, T. tilianim (so named, from infesting the Lime), 

 but which is also at times injurious to French Beans and 

 some other garden-crops. 



These Acari or mites, which are figured above were 

 exceedingly injurious in the autumn of 1880, to some Lime- 

 trees at Walthamstow, from which specimens were sent me. 



