Sampling techniques and preparation of partial life tables for the olive fly, <i>Dacus oleae</i> (Diptera: Trypetidae) in Corfu

Kapatos, E. T.; McFadden, M. W.; Pappas, S.

doi:10.1111/j.1365-2311.1977.tb00881.x

Cited by 12 publications

(9 citation statements)

References 4 publications

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“…A different approach is therefore taken in the present study where partial age-specific life-tables are obtained from sleeve cage experiments. The results generally support earlier observations which indicate a continuous improvement of the conditions for the immature D. oleae in the course of the season (DELRIO and PROTA 1975/76;and others cited herein;KAPATOS et al 1977, BICLER 1980. Apart from the age which the infestation reaches, insect caused fruit drop is also related to the amount of physiological fruit drop.…”

Section: Discussionsupporting

confidence: 91%

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Olive fruit drop caused by Dacus oleae (Gmel.) (Dipt. Tephritidae)

Neuenschwander

Michelakis

1981

Zeitschrift für Angewandte Entomologie

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The rate at which infested olives drop was related to the developmental stage of D. oleae and to natural fruit abscission. Partial life-tables concerning the survival of eggs and larvae were obtained from sleeve cages in which the olives had been infested over a short period of time. Fruit drop under these conditions was then compared with fruit drop of uninfested and infested olives in the field. Also, resistance values for olive detachment were measured.Olives with exit holes dropped at a rate 2.5 and 3.3 times higher than those containing a larva, in the Koroneiki and Tsounati varieties respectively. Olives containing larvae were found less frequently among the dropped olives than on the tree because, from autumn onward, female D.oleae preferred to oviposit in the less ripe olives with their lower rate of natural drop. In fact, resistance to detachment of infested olives in comparison to equally ripe uninfested ones diminished slowly as the larvae matured; it decreased mainly after the larvae had left the olives. From summer up to harvest, olives containing dead larvae dropped at double the rate of uninfested ones.Finally, the risk of freshly infested olives for dropping before harvest was tabulated for different values of physiological fruit drop and for each month. Because of high egg and larval mortalities, this level is low in the summer; it then increases to a maximum one month prior to harvest. It is concluded that most fruit loss in Crete is likely to occur in October. Furthermore, damage attributed to D. oleae often appears to be overestimated. Inf. oleic. inter. 43,[21][22][23][24][25][26][27][28][29][30][31][32][33][193][194][195][196]

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Section: Discussionsupporting

confidence: 91%

“…The influence of the infestation on fruit drop therefore depends on the time of attack, and on egg and larval mortality. Generally, mortality is high in summer and low in early winter ( KAPATOS et al 1977).…”

Section: Introductionmentioning

confidence: 99%

Olive fruit drop caused by Dacus oleae (Gmel.) (Dipt. Tephritidae)

Neuenschwander

Michelakis

1981

Zeitschrift für Angewandte Entomologie

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“…Studies at a number of different localities in Greece, e.g. Corfu (McFadden et aL, 1977), the island of Euboea (Stavrakis, 19751, Crete (Sigwalt, 1975) and Kassandra (Economopoulos et al, 1977) indicate that for a period of several weeks during the summer a very high proportion of female Dacus oleae (Gmelin) lack mature eggs in their ovaries.…”

Section: Introductionmentioning

confidence: 99%

Changes in the ovaries of olive flies (Dacus oleae (Gmelin)) during the summer, and their relationship to temperature, humidity and fruit availability

Fletcher¹,

Pappas²,

Kapatos³

1978

Ecological Entomology

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Abstract. 1. Examination of the ovaries of female olive flies (Dacus oleae) from wild populations on Corfu during the summer months of 1975 indicated that all were non‐gravid for a period of several weeks during June and July and the terminal follicles were resorbed. 2. Experiments in outdoor cages indicated that olive fruits could stimulate ovarian development during the summer months. 3. Experiments in constant temperature cabinets indicated that high temperatures (i. e. 26–29°C) in conjunction with a low humidity (45 ± 5°%) inhibited ovarian maturation. 4. Whereas the presence of olive fruits offset the effects of temperature and humidity on ovarian development at 26°C in all flies, at 29°C very few were able to mature their ovaries. 5. It is suggested that it is the interaction of temperature, humidity and access to fruit which determine when ovarian maturation ceases and recommences during the summer months.

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“…The studies on trap-efficiency were carried out at 3 different sites on Corfu: Ropa, Synarades-Linia and Mon Repos between August 1976 and July 1979. The main study site was Ropa, an experimental olive grove in the central part of the island where McPhail traps had been used to monitor adult numbers since 1973Kapatos et al, 1977). Most of the other experiments were carried out in groves at Synarades-Linia in the northwest of the island, particularly during spring and summer when, in contrast to Ropa, large fruit fly populations were present.…”

Section: Methodsmentioning

confidence: 99%

SEASONAL CHANGES IN THE EFFICIENCY OF McPHAIL TRAPS AND A MODEL FOR ESTIMATING OLIVE FLY DENSITIES FROM TRAP CATCHES USING TEMPERATURE DATA

Kapatos¹,

Fletcher²

1983

Entomologia Exp Applicata

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Seasonal changes in the efficiency of protein hydrolysate‐baited McPhail traps used to monitor adult populations of the olive fly. Dacus oleae (Gmel.), on Corfu were investigated from 1976–1979. The mean weekly trap‐catches of traps located on grids in 3 different parts of the island were compared with absolute population estimates of adult flies obtained from mark‐recapture studies at the same sites. Trap‐efficiency was then estimated by dividing the mean weekly trap‐catch values by the estimated number of flies per tree, ♂ ♂ and ♀ ♀ being dealt with separately. For both sexes, trap‐efficiency was low during the winter months and then higher in spring and early summer, reaching a peak in late July/August, just after the new season's olive crop became susceptible to attack. However, earlier in the summer, when the fruit was unavailable or unsuitable for oviposition and when hot dry conditions inhibited ovarian maturation, trap‐efficiency was very variable and frequently fell to a low level similar to that found in winter. Excluding the highly variable mid‐summer data, regression analysis indicated that over 85% of the variation in trap‐efficiency was attributable to differences in mean temperature during the trapping periods. Using the calculated regression relationship between mean temperature and trap‐efficiency, which was similar for both sexes, a model was developed which enables mean weekly trap‐catch data to be converted into absolute population estimates of adult flies. RÉSUMÉ Changements saisonniers dans l'efficacité des lQpièges de McPhailrQ; modèle pour estimer des densités de mouches de l'olive capturées aux pièges en utilisant les relevés de température Les changements saisonniers dans l'efficacité des pièges de McPhail à l'hydrolysat de protéines ont été utilisés pour suivre les populations d'adultes de mouche de l'olive, Dacus oleae, à Corfou de 1976 à 1979. Les captures moyennes hebdomadaires de pièges quadrillant 3 parties différentes de l'ǐle ont été comparées estimations de la population absolue de mouches obtenues par capture‐recapture dans les měmes sites. L'efficacité par piège a été alors estimée en divisant la moyenne hebdomadaire de capture par le nombre estimé de mouches par arbre, les mǎles et les femelles étant traités séparément. Pour les deux sexes, l'efficacité des pièges était faible pendant les mois d'hiver, et plus élevée au printemps et au début de l'été, avec un sommet fin juillet—aoǔt, juste après le début de la vulnérabilité des nouvelles olives. Cependant, plus tǒt dans l'été, quand les fruits sont indisponibles ou ne permettent pas la ponte et quand la chaleur inhibe la maturation ovarienne, l'efficacité des pièges était très variable et était fréquemment tombée à un niveau voisin de celui observé en hiver. En dehors des données très variables du milieu de l'été, l'analyse de la régression a montré que plus de 85% de la variation de l'efficacité des pièges était due à des différences de température moyenne pendant les périodes de piégag...

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Sampling techniques and preparation of partial life tables for the olive fly, Dacus oleae (Diptera: Trypetidae) in Corfu

Cited by 12 publications

References 4 publications

Olive fruit drop caused by Dacus oleae (Gmel.) (Dipt. Tephritidae)

Olive fruit drop caused by Dacus oleae (Gmel.) (Dipt. Tephritidae)

Changes in the ovaries of olive flies (Dacus oleae (Gmelin)) during the summer, and their relationship to temperature, humidity and fruit availability

SEASONAL CHANGES IN THE EFFICIENCY OF McPHAIL TRAPS AND A MODEL FOR ESTIMATING OLIVE FLY DENSITIES FROM TRAP CATCHES USING TEMPERATURE DATA

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