1913.] PUBLIC DOCUMENT — No. 31. 99 



ber mildew {Plasmopara Cubensis (B. & C.) Ilurnphrey) in Massachu- 

 setts; the muskmelon bliiiht; an apple leaf spot; a strawberry disease; 

 plum "yellows; " spraying' of linden and elm trees for leaf spot; erojjs 

 under tent cloth; experiments in heating soils; influence of sterilized 

 soil on seed germination. 



Sixteenth report, 1903: influence of current electricity on i)lant 

 growtli; influence of atmospheric electrical potential on plants. 



Seventeenth report, 1004: crops as related to weather conditions; 

 testing of seed ; the practice of soil sterilization ; influence of electrical 

 potential on the growth of jjlants; some important literature relating 

 to disease of crops not generally believed to be caused by fungi or 

 insects. 



Eighteenth report, 1905: downy mildew of tomato {I'hytophlhora 

 infestans DBy.) ; potato rot [Pliylophthora infcstans DBy.) ; cucumber 

 and melon blight; sun scald; burning- of conifers and evergreens; winter 

 killing; relation between soil aeration and germination and growth; 

 comparison of sterilized loam and subsoil ; influence of soil sterilization 

 on seed germination; an application of the copper sulfate treatment; 

 a comparison of the numbers of bacteria in stei'ilized and unsterilized 

 soils. 



Nineteenth report, 190G : outline of work; seed work; jirevalence of 

 fungi, etc.; bacterial disease of cucumbers; bacterial disease of lettuce; 

 baeteriosis of geraniums; tobacco troubles; monilia on peach stem; 

 the lime and sulfur mixture as a fungicide; potato-spraying experi- 

 ments; banding substances for trees; effects of escaping illuminating 

 gas on trees; germination and growth in soils of different texture; 

 texture of Massachusetts soils. 



Twentieth report, 1907: outline of the year's work; seed work; 

 seasonal peculiarities ; sun scald ; sun scorch premature defoliation of 

 trees; asparagus rust; asparagus Fusarium; peony troubles; potato 

 diseases; experiments with fungicides; influence of various potash salts 

 on potato scab (Odspora scabies Tliaxter) ; investigations relating to 

 mosaic disease; some factors which underlie susce^jtibility and immunity 

 to disease. 



Twenty-first report, 1908 : brief notes on the weeds of Massachusetts ; 

 results of seed separation ; examination of onion seeds for fungous 

 spores; bacterial rot of cabbage and cauliflower; crown gall; the pres- 

 ervation of maple syrup ; onion rot ; onion smut ; a disease of the radish ; 

 celery crown rot; eel worms (Ileterodera radicicola (Greef.) Miill.) on 

 lettuce; influence of water on eel worms; influence of lime on eel worms; 

 effects of chemicals on vegetation ; substances and methods used in 

 exterminating weeds; seed Avork; common weed seeds in grass seed 

 and cattle foods. 



Twenty-second report, ]909: diseases more or less common to crops 

 during the year; shade tree troubles; malnutrition; calico or mosaic 



