1920] ECONOMIC ZOOLOGY ENTOMOLOGY. 49 



Experiments on the control of Narcissus eelvvorni in the field, J. K. 



IlAMSBOTTOM {Jouf. Roy. Hoit. Soc, JfJf {1919), PI). 68-72, pi. 1, fig. 1; (ihn. in 

 Rev. Avpl. Ent., tier. A, 7 (1919), No. 8, pp. 355, 356). — Experiments with 

 manures and chemical sterilizers were alike ineffective in freeing soils from 

 nematode infection or in protecting crops from nematode attack. 



Experimentation on different crops with a view to securing a rotation that 

 would avoid or minimize nematode attack showed that Tylenchus devastatrix 

 may become so adapted to a particular host species as not to attack with 

 severity other host siiecies. In a series of plants including rye, winter and 

 spring oats, clover, alfalfa, peas, broad beans, rye-grass, onions, wheat, chives, 

 buckwheat, and potatoes, tested as possible successors to Narcissus on ground 

 infested with nematodes, onions only were seriously affected. 



The Iceland poppy disease, C. C. Brittlebank (Jour. Dept. Agr. Victoria, 

 11 (1919), No. 11, p. 700). — It is stated that during the past few years a disease 

 of poppy from which a species of Phytophthora has been isolated has killed 

 off from 80 to 90 per cent of these plants. Symptoms are briefly described. 

 Complete control is obtained by use of a 6 : 9 : .50 Burgundy mixture. 



A destructive disease of seedling trees of Thuja gigantea, (J. H. Pethy- 

 J5KIDGE (Quart. Jour. Forestry, 13 (1919), No. 2, pp. 93-97). — An account is 

 given regarding a brief study of a fungus attacking young larch, which proved 

 to be a Botrytis ; also of one causing failure of young Tlmja trees subse(iuently 

 identified as due to Keithia thujina and now found supposedly for the first 

 time outside of North America. 



A new leaf disease of Hevea caused by a mildew (Oidium sp.) , P. Arens 

 (Arch. Rubbercult. Nederland. Indie, 2 (1918), No. 10, pp. 827-835). — A new 

 mildew of young Hevea leaves is provisionally reported as present throughout 

 Java. The foliage may be thinned to any degree, with corresponding effect on 

 the trees. The organism is said to be an Oidium. 



Lebbra and vaiolo of sumac, G. B. Traverso (Staz. Sper. Agr. Ital., 52 

 (1919), No. 5-6, pp. 213-225, pis. 2). — An account is given of two diseases of 

 Rhus coriaria said to be new in Italy. The first shows itself in a leaf colora- 

 tion and dleback and has been ascribed to Exoascus purpurascens. The other 

 appears as a discoloration with minute spots and is ascribed to Septoria 

 rhoina, a supplementary description of which is furnislied. 



Reddening of sumac leaves, G. Lo Priore and G. Scalia (.SYoc. Sper. Agr. 

 Ital., 52 (1919), No. 5-6, pp. 227-237, pis. 2).— The authors describe Exoascus 

 (Taphriiiella) purpurascens as found in leaves of Rims copallina in Mas.sachu- 

 setts and Connecticut. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Waterfowl and their food plants in the sandhill region of Nebraska 



(U. S. Dept. Agr. Bui. 79^ (1920), pp. 77, pis. 5).— This is the first of a series 

 of papers designed to present information on the breeding, wintering, and 

 hunting grounds of waterfowl in the United States. The report consists of 

 two parts. 



I. Waterfowl in Nebraska, H. C. Oberholser (pp. 3-35). — This is a report on 

 the water birds, together with data on the numbers and species occurring dur- 

 ing the breeding and hunting seasons in Nebraska, chiefly in the sandhill 

 region, which informati(m is a necessary basis for protective legislation. The 

 sandhill region is an irregular area lying in the north-central part of the State, 

 extending east and west for about 250 miles, north and south for about 140 

 miles, and occupying approximately one-fourtli of the State. This area has 



