250 Cultivation of Arable Land. HopsDifeafes of -Green Fly, fyc 



This infect commits its greateft depredations in the more early cold fpring 

 months, as the latter end of April and beginning of the fucceeding monthy difap~ 

 pearing as the feafon becomes mild and warm.* 



The principal remedy in this cafe is that of having the land in a fufficient ftate 

 of fertility, to enable the young plants to moot up with fuch vigour and rapidity 

 as to become quickly incapable of being fed upon and devoured by the infect.. 

 Stirring the mould about the roots of the plants by means of the hoe may alfo be 

 of utility in the fame intention. 



The green or long-winged fly generally makes its appearance about the latter 

 end of May, and in the two following months* The prevalence of north eafterly 

 winds about the above period has much effect in producing thefe infects, which are 

 very deftructive of the young leaves of theplants. Under fuch a ftate of the wind 

 they are faid to fcarcely ever fail covering the leaves;, and by dropping their ova 

 produce an abundance of lice, by which the crops are often much injured, as when; 

 they have once obtained complete pofFcflion of the plants they feldom or ever leave 

 them before they are wholly deftroyed. The forwarded and mofb luxuriant hop- 

 binds are faid to be in general the mod difpofed to be attacked by infects of this 

 fort. The removal of the infects chiefty depends upon a change taking place in the 

 wind from the above points- more to the fouth, and the fetting-in of mild and; 

 warm weather. 



The otter moth, by producing its larvae upon the roots of theplants,. fubjects 

 them to be attacked by thenr^ and the healthy growth of the hops- to be in that 

 way greatly impaired, the crops being of courfe much injured in refpect to their; 

 produce. In this cafe,, ftirring the earth well about the roots of the plants may 

 probably fometimes be fervieeable. 



The honey dews moftly occur after the crops have been attacked by fome of 

 the above kinds of infects, and when the weather is clofe, moift, and foggy. lir*. 

 thefe cafes a fweet clammy fubftance is produced upon the leaves of the plants, 

 which has the tafte of honey. They have at firft a fhining appearance, but after 

 wards feon become black. The nature of this vegetable affection does not feem 

 to be yet well afcertained.. It is fuppofed by fome to be the excrement of infects 

 of the aphis kind, depofjted by them upon the leaves of the plants after it has 

 been extracted by their puncturing the leaves. Others however contend that it 

 as a morbid exudation proceeding from the plants thtmfelves ; which is much more 



* Synopfis of Hufbandry. 



