. Bulletin of the Department of Agriculture. Agriculture; Agriculture. FROST PROTECTION IN LEMOoST ORCHARDS. 29 ^iZ/VJ' /t/(y //oi^ From the data secured in these plats and from o})scrvations made in other orchards it appears that the Lisbon variety, probably owing to its dense foliage and more compact habit of growth, was not quite so susceptible to frost injury as the Eureka. These observations apply entirely to groves which are not protected by orchard heaters. In well-protected orchards there were comparatively small numbers of frozen lemons of either the Eureka or Lisbon variety. It
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. FROST PROTECTION IN LEMOoST ORCHARDS. 29 ^iZ/VJ' /t/(y //oi^ From the data secured in these plats and from o})scrvations made in other orchards it appears that the Lisbon variety, probably owing to its dense foliage and more compact habit of growth, was not quite so susceptible to frost injury as the Eureka. These observations apply entirely to groves which are not protected by orchard heaters. In well-protected orchards there were comparatively small numbers of frozen lemons of either the Eureka or Lisbon variety. It therefore appears that, although in un- protected orchards undersimilar conditions, a greater amount of injury is found in Eureka than in Lisbon orchards, the differ- ence is not sufficiently great to warrant any positive statements concerning the comparative hardiness of the two varieties. SUMMARY. Extremely low temperatures during December, 1912, and January, 1913, caused serious damage and loss to unprotected lemon orchards in many sections of southern California. Detailed records of the pro- portion of merchantable and frozen fruits produced in five heated and five nonheated acre plats of Eureka and Lisbon lem- ons during the calendar year 1918 and in two comparative plats during the calendar year 1914 in the Corona, Calif., lemon district are presented in this bulletin. These data show that in or- chards which were protected with an adequate supply of heaters during the cold weather of 1912-13 a large percentage of merchantable fruit was saved and harvested throughout the year. In orchards which were not heated a large proportion of the lemons picked during the first six months following the freeze were frozen or unmerchantable, and the trees did not return to normal production until a year had Fig. 15.—Diagram prepared from the figures presented in Table XXII, showing the percentages of mer- chantable and frozen fruits produced on the non- heated acre of Lisbo
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