1054 EXPERIMENT STATION RECORD. 



those varieties which have hard, woody steins are less susceptible than 

 the succulent ones. Pouring fungicides, such as potassium sulphid, 

 ainmoniacal copper carbonate, or eau celeste-, about the plants will tend 

 to the suppression of this disease, as the principal portion of the life of 

 the fungus is spent underground. 



Notes are given on leaf blight, damping off, and the tomato worm, 

 with suggested remedies for each. 



A disease due to Pkytoptus calcladopkora is described. This mite 

 appears to be confined, in the United States, to Florida, though doubt- 

 less the same disease has been reported from Spain and Italy. The 

 mites attack the growing bud of the plant and later the fruit buds, 

 causing white hairs to grow out from the epidermis, giving the plant a 

 peculiar ashy white appearance in the affected parts. Applications of 

 sulphur iu the form of spray, such as recommended for the rust mite 

 of the orange, or the sprinkling of the plants with flowers of sulphur 

 have been found to be very efficacious. 



Hoot knot, due to Heterodera radieieola, is briefly described, and when 

 present the vines, after bearing, should be collected and burned and 

 some other crop grown on the soil for a year or more. 



Considerable loss has been reported due to the dropping of fruit 

 buds from the vines. The causes have been investigated to some 

 extent, and it was found due to partial arresting of the vegetative 

 functions of the plants as well as the lack of fertilization. Another 

 cause, which is capable of being controlled, is too great vegetative 

 growth, and this can be prevented by topping the plants. 



Tomato plants are reported as frequently suffering from what is 

 described as hollow stem immediately after being set out from the seed 

 bed. Plants so affected make little or no growth. The causes which pro- 

 duce this trouble are stated to be highly nitrogenous soil in the plant bed, 

 an abundance of water to make the fertilizers quickly available, a quick- 

 growing variety of tomatoes, transplanting without hardening off, and 

 planting into a dry soil necessitating the use of water. The author 

 states that several of these causes acting in conjunction will produce 

 the disease. Its prevention is quite obvious from the causes to which 

 it is attributed. 



The stem-rot diseases of the carnation, F. C. Stewart (Bot. Gaz., 

 27 (1899), No. 2, pp. 129, 130).— -The author states that at least two dis- 

 tinct diseases of carnation shave been confused under the names " stem- 

 rot" or "die-back." One is caused by Ehizoctonia; the other is due to 

 a Fusarium. Both diseases are said to be common in the field and 

 greenhouse. The Fusarium attacks chiefiy the stem and larger branches, 

 discoloring the wood and killing the cortex, but rarely causing a soft 

 rot. The affected plants die gradually with yellowing or drying foliage. 

 The fungus rarely fruits on the outside of the stem, but does so fre- 

 quently in the cambium and pith of stems which have long been dead. 



The Ehizoctonia causes the plants to wilt suddenly by rotting the 



