752 EXPEKIMENT STATION EECOKD. 



Resistance of oak wood to dry rot (Merulius lacrymans), C. Wehmer {Ber. 

 Dent. Bot. Gesell., 29 {1911), No. 10, pp. 70//-70S, fig. i).— This iuvestigatiou, 

 wbich seems to have been induced by the assertion often made on apparently 

 insufficient grounds that oak is peculiarly susceptible to the attacks of this 

 rot, is claimed to sbow that oak is attacked with difficulty or not at all by this 

 fungus. In a case observed by him, the author claims that while the pine 

 uiulerlayer of a paniuet floor was decayed and full of the mycelium of M. 

 lacrymans, which covered and enclosed some of the overlying oak blocks with 

 a two-years' growth, he found the oak to be completely free from attack by 

 the fungus. Laboratory experiments gave no other result. The oak was 

 attacked by several other fungi, but M. lacrymans attacked other woods. 



Further investigation is promised on the chemical and other characters of 

 the woods in question. 



The rot of scarlet maple produced by Deedalea unicolor, P. Baccarini 

 (Bui. Soc. Bot. Hal., 1911, No. 6, pp. 100-lOJf; abs. in Internal. Inst. Agr. 

 [Rome], Bui. Bur. Agr. Intel, and Plant Diseases, 2 (1911), No. 7, p. 1800).— 

 The presence of fructifications of D. unicolor, frequently found on various 

 forest trees such as hornbeam, beech, oak, and horse chestnut, is reported on 

 Acer rul>rum in the botanical gardens of Florence. 



The author believes that the withering of the tree and the gradual decline 

 of its foliage is due to the presence of this fungus, which has caused a special 

 decay of the wood, transforming it into a white fibrous mass which breaks 

 on the slightest occasion. The fungus is believed to be a wound parasite with 

 a very feeble reaction opposed to the tree's activity, which accounts for its 

 slow spread in living trees. 



Injury to Pinus strobus caused by Cenangiuni abietis, K. Fink (Phytopntli- 

 ology, 1 (1911), No. 6, pp. 180-183, pi. l).—ln the summer of 1909 a group of 

 6 white pine trees at Oxford, Ohio, was found to be in a diseased condition, 

 and an examination made by the author showed that a large proportion of 

 the leaves and twigs on the northeast sides of 3 of the trees were dead or 

 dying. On the twigs bearing the dead leaves were found black spherical 

 tubercles, which upon identification proved to be C. abietis. 



The diseased trees were from 1.5 to 2 ft. in diameter and about 55 5'ears 

 old. Other white pines growing within a few rods of the diseased ones were 

 not affected, so far as could be observed. The 2 trees most severely affected 

 died in August of the year in which the disease was first noticed. These were 

 on the' highest ground and were probably injured more than the other trees 

 by the severe drought of the previous year. The disease is said to occur only 

 occasionally and after periods of prolonged drought. This is apparently the 

 first report of serious injury by this fungus in Korth America. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Insect pests of farm, garden, and orchard, E. I^. Sanderson (New York 

 and London, 1912, pp. XII+68J1, figs. 513). — This work discusses the more 

 important insects of farm, garden, and orchard at sufficient length to give a 

 clear idea of their life history and habits and the best means of control. It 

 is intended for use both by the student of economic entomology and by the 

 practical farmer, gardener, or fruit grower. With the exception of citrus 

 fruits, the insect enemies of practically all of the leading crops are considered. 

 The author states that in general the discussion of insects and their control 

 is based upon conditions east of the Rockies and that practically no con- 

 sideration has been given to the conditions of the Pacific Coast or of the irri- 

 gated country of the far West. 



