X 
Journal of Agricultural Research 
Vol, VIII 
Page 
Oospores of P. arecae. D.—Chlamydospores of P. parasitica. B.—Oospores 
oi P. erythroseptica. F.—Oospores of P. phaseoli . 276 
Plate 77. Chlamydospores and oospores of the various species of Phytoph- 
thora. A.—Chlamydospores of P. faberi. B.—Oospore-like bodies of P. 
infestans. C.—Oospores of P. cactorum (Phyllocactus sp.). D.—Oospores 
of P.fagi. B-—Chalmydospores of P. nicotianae .. 276 
Tetrastichus bruchophagi, a Recently Described Parasite op Bru- 
CHOPHAGUS FUNEBRIS 
PLATE 78. Tetrastichus bruchophagi: A.—Larva. B.—Pupa. C.—Adult. . . . 2S2 
Arsenical Injury Through the Bark of Fruit Trees 
Plate 79. Funnel used in the treatment of trunks with arsenical solutions and 
suspensions. 318 
Plate 80. Dissection of bandage used in the treatment of branches with 
insoluble arsenical compounds. 318 
Plate 81. Character of rough bark of apple tree: A.—First splits in the forma¬ 
tion of rough bark. B.—Roughened condition as found on practically all 
old trunks and limbs. 318 
Plate 82. Lenticels of different ages: A.—Lenticels on a young shoot that has 
just completed the season *s growth. B.—Lenticels on a limb about 8 years 
old. C.—Lenticels on roots... 318 
Plate 83. A.—Section through a lenticel just forming. B.—Section through a 
well-developed lenticel. C.—Lenticel spots formed by the absorption of 
zinc arsenite through lenticels inclosed in arsenical bandages. 318 
Plate 84. Character of arsenical injury: A.—Branch treated with a solution of 
arsenic acid. B to I.—Portions of tree injured by a single treatment with 
sodium-arsenite solution. B.—Cross section of main limb 1 foot below 
intersection with treated branch. C.—Cross section 16 inches below band¬ 
age and just above main limb. D.—Cross section under bandage just below 
wounds. B.—Cross section 1 foot above bandage. F.—Surface view 8 to 
11 inches below bandage. G and H.—Cross sections of side branch that 
joined treated branch 8 inches below bandage. I.—Main limb with treated 
branch removed. 3x8 
A Squash Disease Caused by Choanephora cucurbitarum 
Plate 85. Choanephora cucurbitarum: A.—Immature conidiophore with ramuli 
developing on the primary vesicle. B.—Budlike processes the beginning 
of conidial formation on the capitellum. C.—Conidia. D.—Mature capi- 
tulum covered with a layer of conidia. B.—Primary vesicle from which 
ramuli have been detached. F.—Mycelium in tissue of squash-flower 
pedicel. G.—Germination of conidia 3X hours old in nutrient agar. H.— 
Germination of conidia hours old in water. I.—a, Barly stage in germi¬ 
nation of conidia in hanging drop; b , growth of mycelium from same conidia 
as figure a drawn 15 minutes later: c , one-half hour later than figure a; d, 
15 minutes later than figure c; e, one hour later than figure a. J.—Germi¬ 
nation of sporangiospores. K.—Mycelium of the fungus within the tissues 
of squash fruit. L.—Variation in size of sporangia and columella. M.— 
Chlamydospores borne in chains in old cultures. N.—Sporangiospores 
with tufts of hairlike appendages. O.—Chlamydospores formed singly in 
4-day-old cultures. 328 
Plate 86. Choanephora cucurbitarum: A.—Gametes prior to fusion. B.— 
Young zygospores whose exospore has not yet developed and whose con- 
