246 MASS. EXPERIMENT STATION BULLETIN 271 



hite benching, overhead watering for controlling red spider, over-watering, 

 and high house temperatures. A comparison of overhead watering and 

 naphthalene fumigation for combating red spider showed 27 per cent 

 increase in production of flowers in favor of naphthalene fumigation. The 

 difference is attributed to a higher mortality of plants from Alternaria and 

 Fusarium where water sprays were used for controlling red spider, and to 

 better growth among plants subjected to naphthalene fumigation, result- 

 ing from particular house atmospheric conditions attendant with the use 

 of naphthalene. 



Plant Diseases not Previously Reported in Massachusetts. (O. C. Boyd 

 and W. H. Davis). Leaf-blight of corn, caused by Helminthosporium turci- 

 cum Pass., on Golden Bantam, Yellow Dent, Stowell's E\ergreen; leaf-spot of 

 Lupinus polyphiiJlus, caused by Alternaria sp.; Botrj'tis wilt of Lupinus poJy- 

 phyllus, caused by Botri/tis vulr/aris Fr. ; fruit-drop of grape, caused by Pest- 

 alotia nvicoJa Speg., especially severe on Brighton grape; twig-blight of 

 American bladdernut, caused by Coryneum microstictum Berk. & Br.; rust of 

 Iris sp., caused by Puccinia irid'is (DC.) Rabh.; halo blight of Lima bean, 

 caused by Bacierium medicaginis (Sack.) EFS. phaseoUcoJa Burk. ; bacterial 

 leaf-spot of cabbage and cauliflower, caused by Bacterium maculicolwm McC. 

 (apparently) ; angular leaf-spot of cucumber, caused by Bacterium lackry- 

 mans Smith & Bryan; bacterial leaf-speck of muskmellon, undescribed and un- 

 determined; bacterial leaf-spot of summer squash, caused by Bacterium cu~ 

 curbitae Bryan; leaf and fruit-spot of pepper, caused by Bacterium vesica- 

 torium E. M. Doidge; bacterial wilt and root-rot of alfalfa, caused by Aplan- 

 obacter insidiosum McC; stem-rot of sweet clover, caused by Corticium vag- 

 um Berk. & Curt.; limb canker of blue spruce, caused by Cytospora sp., pre- 

 viously observed for many years but cause not determined; wilt of Japanese 

 barberry, caused by VerticiUimn alboatrum Reinke & Berth.; bud-blight of 

 Gardenia, cause undertermined, associated with the presence of mealybugs 

 and probably bacterial; bacterial blight of soy bean, caused by Bacterium 

 sujae Wolf.; leaf-spot of Zinnia (Bacterial; undet.) ; ring-spot of tobacco 

 (Virus). 



Forcing Gladiolus with the Aid of Artificial Light. (L. H. Jones). 

 Gladiolus corms of tiie variety Crimson Glow, kept in cold storage during 

 the summer, were planted August 21 and September 11. All plants re- 

 ceived the normal daylight under glass. Half the plots were curtained off at 

 night and each of these received electric light from a 100 watt bulb. In 

 the planting of August 21 there was an increase of 100 per cent in tfie 

 number of spikes produced in the artificially lighted plots compared with 

 the non-illuminated plots. In the planting of September 11 fewer spikes 

 were produced in the lighted i)l()ts than in the lighted plots of August 21, 

 but no spikes at all were produced in the plots not receiving light. Several of 

 the spikes were in full bloom for Christmas Day. In a later experiment an 

 effort was made to determine whether better results could be obtained 

 from side lighting as distinguished from overhead lighting. Both 100 

 and 300 watt ligiits were used. No measurable differences were noted. 



The Storage of Gladiolus Corms. (L. H. Jones). Gladiolus corms are 

 harvested in the early autumn and placed in storage until the following 

 spring. Forcing gladiolus in tlie winter has made it necessary to carry 

 the corms in cold storage during the summer, thus prolonging the dormant 

 period. A cold storage temjierature of about 38° F. gave the best results 



