STEM EELWORMS. 51 
which specimens of ‘‘ Stem-sick’’ Clover had been sent me in the pre- 
vious year brought an excellent growth, excepting on one sandy knoll. 
In a series of experiments, steamed bone-flour, three cwt. per acre, 
did not succeed; there were ‘*a number of unhealthy plants.” Sul- 
phate of potash, three cwt. per acre, answered excellently ; ‘‘not an 
unhealthy plant on the whole plot.’”’ Mixture of about two parts of 
sulphate of potash, three parts sulphate of ammonia, and four parts 
of phosphates, also was very good; “plants healthy, with exceptions, 
gives promise of being the largest crop of any of the plots.’ Sulphate 
of ammonia, one and a half per cent., had a number of unhealthy 
plants, but was taking on a healthy growth at the time of report. The 
worst of all was a plot that was left unmanured, which had a yellow 
sickly appearance, and “‘a great number of unhealthy plants.” —(J. HE.) 
Another recipe found to answer well for attack in ‘‘ Tulip-rooted”’ 
Oats or “ Stem-sick’’ Clover is the following mixture: sulphate of 
ammonia, four parts; sulphate of potash, one part; and steamed 
bones, two parts; this at the rate of one and a half cwt. per acre, 
followed up by a dressing of two ewt. per acre of sulphate of ammonia. 
The result gave so luxuriant a growth that in little more than a fort- 
night after the second dressing, the unhealthy plants, if any remained, 
ceased to be noticeable. 
In 1889 I was favoured by Mr. John Willis, of Harpenden, with 
notes of most satisfactorily successful experiment on an Kelworm- 
infested Clover field at Rothamsted, of which I gave the details in my 
‘Thirteenth Annual Report,’ pp. 10 and 11, and of which the results 
may be given just shortly as follows:—A mixture of sulphate of 
potash three cwt. and sulphate of ammonia one cwt. per acre was 
applied on April 8rd. The disease ceased, and the Clover made a 
very vigorous growth, which was continued markedly in the second 
crop. Sulphate of iron at the rate of two cwt. also answered very 
well, both in stopping the disease and giving good growth; but the 
growth of the second crop was not quite so luxuriant as with the other 
application : and the sulphate of iron at the rate of one cwt. per acre 
was not so serviceable in stopping spread of the Kelworm infestation. 
All measures, whether of treatment of the ground, or of liberal 
and rich manuring, of a nature calculated to drive on a hearty and 
healthy growth are serviceable in supporting infested plants, if of 
material suited for its peculiar nature. But nitrate of soda, though 
so valuable in many cases as a remedy, has proved, so far as reports 
sent to myself go, nearly or wholly valueless as an antidote to Kelworm- 
sickness ; and for reasons given below, farmyard manure is sometimes 
a means of spreading the infestation by the Kelworms which may be 
contained in infested straw in it. 
Amongst measures of prevention, one that is very important is 
E 2 
