. Cottony rot of lemons in California. andfibrous in its advanced stages. The characteristic sclerotia, Fig. lb,are often, but not always, present. When the twig is at length sur-rounded by the fungus, death takes place suddenly, the leaves becomerolled-up and dead, but may remain attached for some months. Thislast characteristic is the most noticeable and is what usually attractsthe growers attention to this disease in the orchard. COTTONY ROT OF LEMONS IN CALIFORNIA 239 NATURAL INFECTION Picking-Box Infection.—It is only occasionally that the conditionsare favorable for cottony rot to develo
. Cottony rot of lemons in California. andfibrous in its advanced stages. The characteristic sclerotia, Fig. lb,are often, but not always, present. When the twig is at length sur-rounded by the fungus, death takes place suddenly, the leaves becomerolled-up and dead, but may remain attached for some months. Thislast characteristic is the most noticeable and is what usually attractsthe growers attention to this disease in the orchard. COTTONY ROT OF LEMONS IN CALIFORNIA 239 NATURAL INFECTION Picking-Box Infection.—It is only occasionally that the conditionsare favorable for cottony rot to develop in the picking boxes, as thefruit remains in these only a short time before being washed. Severalinstances, however, have come to our notice in which, under favorableconditions, a large amount of this decay (possibly as much as 75 percent) did develop. The fruit was picked and left out in a rain ofseveral days duration without protection. Under these conditions notonly a great amount of decay was to be detected when the fruit was. Fig. 2.—Peziza or spore stage showing varying lengths of stem from sclerotiato the funnel-shaped disk, apothecia, of cottony rot fungus. The length of stemvaries according to the depth below the surface of the sclerotium. washed, but this continued to appear during the process of a few localities the fruit is stored in the picking boxes and no wash-ing of the fruit is considered necessary. In these cases the picking boxbecomes also the storage box. Packing-House Infection.—The infection of fruit in the packinghouse is the chief injury done by the cottony rot fungus. The fruitis left in the curing tents or tight rooms from one to two months afterbeing washed, when the final sorting, grading and packing of the fruittakes plaee. During this time, especially on fruit unusually weak, thecottony rot has a favorable chance to develop. The decay is foundalmost entirely during the spring and winter months, January to 240 UNIVERSITY OF CALIFOR
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