Étude Comparative de la Biologie de deux Coléoptères Buprestidae Nuisibles aux Arbres Fruitiers en Iran
Étude Comparative de la Biologie de deux Coléoptères Buprestidae Nuisibles aux Arbres Fruitiers...
Radjabi, G.
1971-01-31 00:00:00
SUMMARY G. Radjabi: A comparative study of biology of two Coleoptera Buprestidae damaging fruit trees in Iran. Ethology: Sphenoptera davatchii and S. kambyses are secondary parasites attacking decaying trees, of which the degree of feebleness must not exceed up to a point. Eggs are chiefly laid on branches of which the degree of humidity is varying between 15 and 40% of the whole weight. Biology: Larval development and pupation occur under the bark and the study of this environment has showed the prominent part of humidity and temperature, the latest can rise 10° C above that of exterior environment (in summer). There is a single generation every year. The adults appear in May and the beginning of the flight is nearly identical for both species, but the exit period of S. davatchii is longer, this fact is probably in connection with the differences observed in the larval development of these two species. The duration of laying period agrees with the exit one of adults and egg hatching varies between 8 to 13 days according to insolation. The study of evolutive cycle of both species has showed the great difference existing between their development; S. davatchii hibernate at any larval stage and pupation takes place in the next spring, after a short period of prepupation not passing beyond 10 days, whereas S. kambyses's larvae pass into prepupal stage early in late summer, this state stands more than 8 months and extends up to the end of spring of the next year. There are four larval stages. The temperature and humidity prevailing into larvals galleries have an effect upon larval development and duration of prepupal stage, but, S. davatchii can proceed to complete development without binding diapause if cold is missing. On the other hand, about S. kambyses, a space of time, another factor that the cold, is required to get on pupal stage, as its larvae turn into prepupae before cold season, in late summer. Ecology: Populations fluctuations of both species is produced by the effects of several factors. 1 — Biotical potential: the numerical ratio of sexes is nearly identical to unity and the same for both species, the females of S. kambyses lay more eggs than the other's ones 2 — Environment strength. a) Physicals factors: the S. davatchii larvae stand lower temperature than S. kambyses prepupae, but, inversely, the latest withstand more warmth. The superior letal temperature is of 53 °C for the first and 57 °C for the second. b) Trophic factors: the issue of interspecific competition is propitious to S. kambyses, owing to swifter development of its larvae requiring much feeding, this peculiarity occurring also in the case of specific competition. c) Physiological factors of the host-plant: attacked trees react against the beetles by emission of gum, which destroys a certain number of eggs and larvae. d) Biotic factors: an Acarina, some Hymenoptera and Coleoptera are parasites of S. davatchii. Only Hymenoptera have been found on S. kambyses. Owing to inequal reaction of both species to low and high temperatures, their distribution across Iran depends on climatics conditions prevailing in the different areas.
http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.pngAnnales de la Société entomologique de France (N S )Taylor & Francishttp://www.deepdyve.com/lp/taylor-francis/tude-comparative-de-la-biologie-de-deux-col-opt-res-buprestidae-2seBhD20De
Étude Comparative de la Biologie de deux Coléoptères Buprestidae Nuisibles aux Arbres Fruitiers en Iran
SUMMARY G. Radjabi: A comparative study of biology of two Coleoptera Buprestidae damaging fruit trees in Iran. Ethology: Sphenoptera davatchii and S. kambyses are secondary parasites attacking decaying trees, of which the degree of feebleness must not exceed up to a point. Eggs are chiefly laid on branches of which the degree of humidity is varying between 15 and 40% of the whole weight. Biology: Larval development and pupation occur under the bark and the study of this environment has showed the prominent part of humidity and temperature, the latest can rise 10° C above that of exterior environment (in summer). There is a single generation every year. The adults appear in May and the beginning of the flight is nearly identical for both species, but the exit period of S. davatchii is longer, this fact is probably in connection with the differences observed in the larval development of these two species. The duration of laying period agrees with the exit one of adults and egg hatching varies between 8 to 13 days according to insolation. The study of evolutive cycle of both species has showed the great difference existing between their development; S. davatchii hibernate at any larval stage and pupation takes place in the next spring, after a short period of prepupation not passing beyond 10 days, whereas S. kambyses's larvae pass into prepupal stage early in late summer, this state stands more than 8 months and extends up to the end of spring of the next year. There are four larval stages. The temperature and humidity prevailing into larvals galleries have an effect upon larval development and duration of prepupal stage, but, S. davatchii can proceed to complete development without binding diapause if cold is missing. On the other hand, about S. kambyses, a space of time, another factor that the cold, is required to get on pupal stage, as its larvae turn into prepupae before cold season, in late summer. Ecology: Populations fluctuations of both species is produced by the effects of several factors. 1 — Biotical potential: the numerical ratio of sexes is nearly identical to unity and the same for both species, the females of S. kambyses lay more eggs than the other's ones 2 — Environment strength. a) Physicals factors: the S. davatchii larvae stand lower temperature than S. kambyses prepupae, but, inversely, the latest withstand more warmth. The superior letal temperature is of 53 °C for the first and 57 °C for the second. b) Trophic factors: the issue of interspecific competition is propitious to S. kambyses, owing to swifter development of its larvae requiring much feeding, this peculiarity occurring also in the case of specific competition. c) Physiological factors of the host-plant: attacked trees react against the beetles by emission of gum, which destroys a certain number of eggs and larvae. d) Biotic factors: an Acarina, some Hymenoptera and Coleoptera are parasites of S. davatchii. Only Hymenoptera have been found on S. kambyses. Owing to inequal reaction of both species to low and high temperatures, their distribution across Iran depends on climatics conditions prevailing in the different areas.
Journal
Annales de la Société entomologique de France (N S )
– Taylor & Francis
Published: Jan 31, 1971
Recommended Articles
Loading...
There are no references for this article.
Share the Full Text of this Article with up to 5 Colleagues for FREE
Sign up for your 14-Day Free Trial Now!
Read and print from thousands of top scholarly journals.
To get new article updates from a journal on your personalized homepage, please log in first, or sign up for a DeepDyve account if you don’t already have one.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.
