443 



maculipenn.is, all from California. The last-named is also recorded as 

 parasitic on a species of Chramesus mining in Robinia neomexicana and 

 on a species of Anthaxia infesting redbud {Celtis reniformis). A key- 

 to the species of Ptinobius is given. 



Baker (A. C). U.S. Bur. Entom. The Identity of Smynthumdes 

 betae, Westwood (Horn.). — Proc. Entom. Soc, Washington, B.C., 

 xxi, no. 2, February 1919, pp. 36-38. [Received 12th September 

 1919.] 



Smynthurodes betae, Westw., here described is distinct from the 

 American beet Aphid, Pemjjhigus betae, Doan, but as the difference in 

 the character of the antennae, on the strength of which it was separated 

 from Forda, Heyd., is so small, it is suggested that it should be placed 

 in that genus. 



RiTZEMA Bos (J.). Verslag over Onderzoekingen, gedaan in-, en over 

 Inlichtingen, gegeven van het Instituut voor Phytopathologie te 

 Wageningen, in het Jaar 1915. [Report on Researches made 

 and Advice given during the Year 1915 by the Institute for 

 Phytopathology at Wageningen.] — Meded. LajidbouwJwogescJiool, 

 Wageningen, xvi, 1919. pp. 105-157. [Received 21st August 

 1919.] 



Pests of grain included the Nematodes, Tylenchus devastatrix and 

 Heterodera schachtii, on rye and oats respectively. Oscinella [Oscinis) 

 frit, L., and 0. pusilla, Meig., did much damage, especially to oats, 

 which were also attacked — for the first time in Holland — ^by the 

 mite, Tarsonemus spirifex. Sugar-beet and clover were also injured 

 by Tylenchus devastatrix. In a series of spraying experiments against 

 the widely- spread scale, Eulecanium (Lecanium) corni, Bch., the 

 best, though limited, result was obtained with a 5 per cent, solution 

 of carbolineum used in January. This insecticide, at a percentage 

 of 3-8, proved efficient against the mite, Bryobia ribis, Thom., infesting 

 gooseberry ; for practical work a strength of 5 per cent, is advised. 

 Incur varia (Lanipronia) rubiella, Bjerk., was successfully combated 

 on raspberry bushes with carbolineum [see this Review, Ser. A, iv, 

 p. 89]. Garden peas were again attacked by Heterodera schachtii. 

 The larvae of a beetle, Phaedon cochleariae, injured cauliflowers, 

 and maggots indistinguishable from those of Phorbia (Chortophila) 

 brassicae attacked Brussels sprouts. Heterodera radicicola did serious 

 damage to tomatoes. 



Coleopterous pests of kitchen gardens included Apian sp., Crioceris 

 asparagi, L., and Gastroidea viridula, DeG. The first-named was 

 checked by spraying with 6-10 per cent, solutions of naphthaline 

 soap, naphthol soap and benzol soap. C. asparagi was checked 

 with a 3 per cent, solution of benzol soap, though the same strength 

 of ordinary soft soap was equally effective, and for G. viridula ^ 

 2 per cent, solution of common soap proved sufficient. 



Experiments were conducted with a view to ascertaining if heat 

 could be safely used for killing Tylenchus devastatrix infesting narcissus 

 bulbs, but no definite result was reached. Other experiments are 



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