ROOT-KNOT EELWORM. 



99. 



Looking at the apparently much greater susceptibility of Daddy 

 Longlegs grubs, that is, of the larvas of the Tipida flies, than those of 

 the larvffi of the Elater beetles, commonly known as Wireworms, to the 

 action of food, it would be well worth while to experiment a little on 

 the above subject, as in case such broadscale application of Mustard- 

 cake as is practicable in field service turned out customarily to be pre- 

 judicial to the Tipida grubs, it would be an exceedingly convenient 

 addition to our knowledg-e. 



TOMATO. 



Also Cucumber Plants, &c., infested by the Root-knot Eelworm. 

 Anguillula radicicohi ; Heterodera radicicola, Greef. ; Ileterodeia 

 radicicoJa, Miiller. 



Heteeodeea radicicola. — 1, larva ; 2 and 3, females ; 4 and 5, eggs in different 

 stages of development : all enormously magnified. (2 from sketch by Ed. ; the 

 other figures after Prof. Geo. Atkinson). 



In my Eeport for 1892, at pages 127 — 137, notes are given of the 

 observation of what I believe to be the first definitely recorded, and 

 specifically identified, appearance in this country of the destructive 

 Eelworm infestation, known by reason of the galls, or knots, to which 

 it gives rise on the roots of many difi"erent kinds of plants, as the Eoot- 

 knot Eelworm, and scientifically as the Heterodera radicicola. 



Full details (or at least sufficiently full details for identification of 

 the attack) were then given, partly from the English specimens placed 



h2 



