Some foundations for the application of aggregation pheromone to control pine bark beetles in Israel
1992
Mendel, Z. (The Volcani Center, Bet Dagan (Israel). Agricultural Research Organization. Dept. of Entomology) | Boneh, O. | Riov, J.
To optimize mass trapping of Orthotomicus erosus and Pityogenes calcaratus (Col., Scolytidae) in Pinus halepensis and Pinus brutia, some stand and soil characters of thinned pine plantations, time of thinning as related to bark beetle outbreak and various characters of trees susceptible to scolytid attack were investigated. Inspection of injury by O. erosus and P. calcaratus showed that the percentage of dead trees decreased with increasing DBH. The average mortality as related to soil type was markedly higher on terra rossa as compared with rendzina. Mortality was low in stands thinned between April and September and high in those thinned between October and March. P. halepensis and P. brutia are apparently susceptible to beetle attack during the second half of the summer after the previous year's thinning. The first trees are killed in June, mortality peaks between August and September, and ceases in early November. The average mortality due to an induced attack of trees baited with Pheroprax was about four times higher in thinned plots 1-3 and 8-12 months after thinning, as compared within unthinned plots. During the first 14 months after thinning, physiological parameters - oleoresin exudation pressure and the amounts of photosynthates in the inner bark of the stem - failed to provide evidence of the expected decrease of tree vigor and differences between trees in thinned vs unthinned plots. Knowledge of the conditions which may lead to an attack, viz. time of thinning, soil type, and time of the expected attack, is of help in improving mass trapping techniques as a part of forest management
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