1908.] PUBLIC DOCUMENT — No. 33. 125 



which have not been pruned. It affected only the lower, 

 shaded limbs, however, and is of little importance, being 

 scarcely perceptible in properly pruned and well-cared-for 

 orchards. The sun scald of two years ago affected many of 

 our wild plants, causing much injury to the wild cornels, par- 

 ticularly to Cornus stolonifera, Michx., and C. circinata, 

 L'Her. 



During the past spring practically every sycamore lost its 

 leaves when they were half grown, from the same cause, and 

 an examination of the young wood of the sycamores showed 

 that all last year's growth was injured ; but as the sycamore is 

 a difficult tree to kill by defoliation, from whatever cause, 

 buds were thrown out from the old twigs, and the trees subse- 

 quently bore a good crop of foliage. The sycamore often 

 becomes defoliated in early summer from the effects of the 

 fungus Glceosporium nervisequum (Fckl.) Sacc, but always 

 succeeds in providing itself with new foliage in a short period 

 of time. Sun scald is a common trouble, and can be easily 

 produced in the laboratory. Our attention has often been 

 called to the sun scald of apple trees, caused by banding with 

 tarred paper, showing that tarred paper should not be used 

 around apple trees without taking precautions. 



Sun Scorch. 

 The past season has been very favorable for sun scorch, this 

 trouble having been much more severe in the eastern part of 

 the State, where the effects of the drought were more marked. 

 Sun scorch is prevalent every summer on certain trees, espe- 

 cially those located in dry soil, and rock maples are peculiarly 

 susceptible in this respect. This season the white pine also sun 

 scorched badly, the injury appearing to be much more general 

 than that which occurred three years ago, but less severe on 

 the foliage, since in practically all cases the burning was con- 

 fined to the apical portion of the needle, and seldom extended 

 to the base. If the needles are not wholly destroyed, no great 

 injury results, and a large number of the trees which were burned 

 three years ago have entirely recovered. Should nothing fur- 

 ther affect the pines, and the condition of the roots improves, 

 the present burning will be scarcely perceptible one year from 



