DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 5-6/1987 str. 29 <-- 29 --> PDF |
6. M i k 1 o š, I., 1979: »Mogućnosti kratkoročnog prognoziranja pojave jasenove pipe (Stereonychus fraxini Deg.) u nizinskim šumama hrasta lužnjaka«. Šumarski list 4—6, Zagreb, str. 139—144. 7. Spaić , I., 1966: »Hrastova osa listarica Apethyrnus abdominalis Lep.«. biološka studija. Poslovno udruženje šumsko privrednih organizacija, Zagreb, str. 1—109. 8. Zakon o zračnoj plovidb i«, Službeni list SFRJ broj 45/1986. 9. Zä ruh a, C, 1987: »Planning of harvesting and silvicultural operations in damaged forest«, TIM/EFC/wp. 1/SAM. 25/R. 5, 6 May. Ofset-tisak. 10. Zivojinović , S.. 1968: »Šumarska entomologija«, II izdanje, Beograd, str. 1—472. Economically Justified Aaerial Control of Forest Insect Pests Summary The authors derive formulae for determining economically justified aerial control iof forest insect pests. They also give formulae related to individual calculating elements by economicall}´ justified control of forest insect pests by means of aircraft. Following elements are taken into consideration: actual intensity of infestation, critical intensity of infestation, monophagous and polyphagous forest insects, size of the treated forest stand, overall area of yearly treated forest stands of a forest enterprise, necessity for construction and maintenance of own airbasses and other facilities for successful aerial treatments or possibilities of making use of an agricultural or sports avation, potential damages from insect pests in individual forest stands or in the whole forest complex and the like. Special attention is paid to the assessment of potential forest damage and to effects of insect pest control in managed and non-managed forests. This article is of theoretical methodological character. It includes also two theoretical examples of applying the formula for determining econodically justified aerial control of both monophagous and polyphagous insect pests. |