62 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
disaster to plant again in infected ground, and land which has never 
before been utilized for bulb cultivation is not necessarily free from 
Tylenchus, seeing that this eelworm is capable of attacking some of 
our commonest grasses and weeds. 
Trap or " Cure " Cropping. — In 1880 Kuhn devised a method of 
reducing the injury caused by the eelworm Heterodera Schactii in sugar 
beet, based upon the principle of trapping the eelworms in some sus- 
ceptible plant and destroying the crop before the nematodes again 
entered the soil. He used a variety of rape for the trap crop, which was 
sown and removed from three to five times in the season. The number 
of eelworms was reduced by this method, and profitable crops could be 
grown again for several years. This method has more recently been 
employed in America for controlling the root-knot eelworm (Heterodera 
radicicola) but without success. For the eelworm under investigation 
a suitable trap crop may be found, but it will have to be one of which 
the seed is cheap, of easy culture, showing great susceptibility to 
attack, of quick growth, and which can be readily removed. 
It appears to be generally held by growers that bulbs naturalized 
in grass escape the attacks of Tylenchus. If this be true, can it be 
that certain grasses attract the eelworm, or that soil conditions of grass 
land, such as lack of air, are unsuitable for the development of eel- 
worm ? Or is it that certain grasses excrete toxins which render the 
soil unfitted for the eelworm ? On the other hand, bulbs grown for 
naturalizing are generally planted in drifts and left undisturbed for 
years, and as a consequence grow freely, so that, should any succumb 
to the disease, they are not missed. One large grower in Guernsey 
seems so convinced that bulbs in grassland are unaffected that he has 
left his beds unweeded and is experimenting in other directions. 
Bulbs which have been left in the ground from lifting and thrown 
into the hedges when the land was cleaned for the next crop have 
been seen to make very luxuriant growth under such conditions, but 
whether the bulbs were healthy or diseased in the first place was 
not ascertainable. 
In this country the treatment of Narcissus bulbs attacked by 
eelworm had received no attention except from Hewitt. Last July, 
when I had convinced myself that eelworms were probably the cause 
of the disease, I wrote to Prof. Ritzema Bos concerning Fusarium. 
He replied as follows : 
" I can assure you that I never have found in Holland a Fusarium 
disease in daffodils (Narcissus). 
"Miss Dr. Johanna Westerdyk in Amsterdam writes that a 
bulb-grower in Holland had sent diseased daffodils to Mr. Massee, s 
who had informed him that he (Mr. Massee) stated them to be infected 
by Fusarium. Mr. Massee says that first the leaves of Fusarium- 
diseased daffodils show yellowish-coloured spots, which are soon 
covered with Fusarium ; afterwards the bulbs are infected, and show 
brown circles when the top is cut off. 
" Miss Johanna Westerdyk never found Fusarium on the yellowish 
