. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PHYCOMYCETES 145 in the packing house, and in storage conditions. From the description subsequently given it may be readily distinguished from forms of decay due to common mold fungi. It is most serious in connection with lemon growing, but the fungus pro- ducing the disease may also affect to a slight extent at least the orange, pomelo, and other citrous fruits. In the orchard the dis- ease may be found upon fruit which has fallen, or that which is hanging very close to the moist
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PHYCOMYCETES 145 in the packing house, and in storage conditions. From the description subsequently given it may be readily distinguished from forms of decay due to common mold fungi. It is most serious in connection with lemon growing, but the fungus pro- ducing the disease may also affect to a slight extent at least the orange, pomelo, and other citrous fruits. In the orchard the dis- ease may be found upon fruit which has fallen, or that which is hanging very close to the moist soil. It is most abundant during wet weather, or follow- ing irrigation, and is therefore intensified where the soils are heavy. It is estimated that under favorable conditions for the fun- gus a box of lemons per tree is no extraordinary loss. Symptoms. The first indica- tions of the trouble may be noted in a brownish or purplish dis- Fig. 46. Brown Rot of Lemon coloration of the rind, showing (After R- E- Smith) light on the greener fruit, and darker on the yellow fruit. Both young and old, vigorous and weak fruits alike are affected, and the disease is particularly characterized by a marked and peculiar odor, by its rapid spread from fruit to fruit, in the packing house, or while stored in boxes, and by the presence of small flies wherever the affected fruit is stored in quantity. After storage for a week or ten days there may develop upon the affected lemons a white mold-like growth (Fig. 46), and frequently upon such affected fruit there is subsequently produced also the blue mold, Penicillium. The blue mold alone, however, does not spread rapidly, and has not the peculiar odor of the brown- rot disease. The disease may appear upon fruit in storage, which seemed to be perfectly colored and sound when passed by the washer. The fungus. The fungus concerned in the production of this decay is apparently one which was unknown until attention was directed to this lemon disease,
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Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
