Аграрный вестник Урала № 11 (129) 2014Лесное хозяйство
ABOUT INFLUENCE OF SCOTS PINE FINE ROOTS ON SURVIVORSHIP AND FERTILITY OF NUN MOTH
Changes in the morphological characteristics of pine undergrowth root systems during the outbreak foci formation and out- break dissipation of nun moth were studied out in the southern part of Sverdlovsk Province in the years 1995–2001. It was established that under influence of weather factors in Scots pine stands spring up deficiency of foliform fine roots in soil layer 2–4 cm below soil surface. Nun moth caterpillars wich feed on the host plant with deficiency of foliform absorbing roots in non-humus soil horizon have increased rate of survival that cause increase of pest abundance. Scots pine stands with deficiency of filiform absorbing roots in distal parts of root systems are becoming outbreak foci of the nun moth. Deficiency of fine roots maintains itself during 4 years. At Scots pines from time to time appear additional short living generations of foliform fine roots with life span 1 year that leads to decrease of caterpillar’s survivorship and decrease of pest population density in the year of ap- pearance of such rots. What is more peculiarities of development of Scots pine fine roots may influence the fertility of nun moth females independently from influence of deficiency of fine roots on the survivorship of nun moth caterpillars. Thus caterpillar survivorship and fertility of females of nun moth are determined by different throphical factors of host plant.
cots pine, nun moth, filiform absorbing roots, weather factors, deficiency of filiform roots, survivorship of nun moth caterpillars, outbreak, mean length of life of absorbing roots, outbreak duration, short-living fine roots, fertility of nun moth
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