336 . 



in the fields, and when such fields are attacked by froghoppers, or 

 become infested with the fungus in consequence of the effects of 

 froghopper attack, the permanence of the result is adequately ac- 

 counted for and such fields pass into the characteristic condition of 

 blight. It does not follow that all blight is caused in the same way ; 

 there may be intense infestation with root disease where froghoppers 

 have never been present. 



Remedial measures can only take the form of agricultural practices 

 that will serve to reduce the injury directly caused by froghoppers 

 and prevent the infestation of fields with root disease. Each estate 

 and even each section of each estate will have to be considered separ- 

 ately in determining the nature and application of remedies. In so 

 far as general measures can be advocated, they are discussed under 

 such comprehensive headings as sanitation, rotation of crops and 

 manuring. Between the reaping of one crop and the planting of the 

 next, there should be an early ploughing out of the stools, with subse- 

 quent working of the land so that they are broken up and rotted, or 

 they may be collected and allowed to rot in heaps. Burning is not 

 advised owing to the loss of organic matter involved. In the case of 

 land subject to blight, it is necessary to go further and clean up the 

 land thoroughly by leaving out a cane crop and alternating with 

 another, the value of several in this connection being discussed. In 

 some cases, e.g. , where it is desired to restore quickly a poor soil, it may 

 be sufficient merely to reduce the number of ratoon crops, without 

 rotation, the extreme of this policy being the growing of plant canes 

 only. 



Barnes (W.) & McDunnough (J.). Notes on the Genus Olene with 

 Description of a New Species. — Canadian Entomologist, London, 

 Out., li, no. 5, May 1919, pp. 102-104. 



The two species of larvae of Olene found in Maine have been pre- 

 viously identified by the authors as 0. vagans and 0. williyigi. It is 

 now recognised that the identification of the latter moth was incorrect, 

 and the species concerned is here described from examples from 

 Ottawa as 0. dorsipennata, sp. n., and a key is given to the larvae of 

 the five species of Olene now known as feeders on deciduous trees. 



Perris (G. F.). Notes on Coccidae. ill. (Hemiptera.). — Canadian 

 Entomologist, London, Ont., li, no. 5, May 1919, p-p. 108-113, 3 figs. 



The species dealt with include : Stigmacoccus asper, Hemp., of 

 which the penultimate stage is described ; Xylococcus hetulae, Perg., of 

 which X. alni, Florence, is regarded as a synonym ; Kuivania quercus, 

 Kuw., of which the penultimate and first larval stage is described ; and 

 Cissococcus fulleri, Ckll, of which some particulars of the first stage 

 larva are recorded. 



CockERELL (T. D. A.). A New Coccid on the Coconut Palm. — Canadian 

 Entomologist, London, Ont., li, no. 5, May 1919, p. 116. 



Furcaspis haematochroa, sp. n., is described from the island of Bat- 

 batan, Philippines, the female scales having been taken on leaves of 

 coco^nut paim. 



