תפריט נגישות
ניגודיות עדינהניגודיות גבוהה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם תפריט נגישותניגודיות עדינהניגודיות גבוההמונוכרוםהדגשת קישוריםחסימת אנימציהפונט קריאסגוראיפוס הגדרות נגישותלהורדת מודול נגישות חינםNitza Saphir and Amiram Zehavi - Forests Department, Keren Kayemet lelsrael, Eshta'ol, Israel
Mortality of Pinns halepensis was investigated in Israel during the first years of natural regeneration after fire, with special emphasis on Matsucoccus josephi and on drought and competition. The investigations were conducted in a natural forest on Mt. Carmel, erroneously believed to be resistant to the scale, and in a plantation severely damaged by the scale at Horeshim in Samaria. Matsucoccus josephi was the dominant mortality agent, killing about 47% of the seedlings during the first four years after regeneration. Neither injury nor mortality due to the scale insect was recorded during the first year after regeneration, with maximum mortality occurring during the third and the fourth years. About 23% of the seedlings died due to drought and to interspecific and intraspecific competition; most of the mortality occurred during the first two years after regeneration. Mortality due to other arthropods was practically nil. It was shown that resistance to the scale of a regenerating population of P. halepensis on Mt. Carmel did not differ significantly from that at Horeshim, despite differences in the level of injury to the adult trees at each site. Seedling density in scale-infested plots, four years after natural seeding, is high enough to ensure stands development with the second growth possibly displaying less susceptibility to M. josephi than the present adult trees.
Nitza Saphir and Amiram Zehavi - Forests Department, Keren Kayemet lelsrael, Eshta'ol, Israel
Mortality of Pinns halepensis was investigated in Israel during the first years of natural regeneration after fire, with special emphasis on Matsucoccus josephi and on drought and competition. The investigations were conducted in a natural forest on Mt. Carmel, erroneously believed to be resistant to the scale, and in a plantation severely damaged by the scale at Horeshim in Samaria. Matsucoccus josephi was the dominant mortality agent, killing about 47% of the seedlings during the first four years after regeneration. Neither injury nor mortality due to the scale insect was recorded during the first year after regeneration, with maximum mortality occurring during the third and the fourth years. About 23% of the seedlings died due to drought and to interspecific and intraspecific competition; most of the mortality occurred during the first two years after regeneration. Mortality due to other arthropods was practically nil. It was shown that resistance to the scale of a regenerating population of P. halepensis on Mt. Carmel did not differ significantly from that at Horeshim, despite differences in the level of injury to the adult trees at each site. Seedling density in scale-infested plots, four years after natural seeding, is high enough to ensure stands development with the second growth possibly displaying less susceptibility to M. josephi than the present adult trees.
