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Reduced-risk management of Rhagoletis cerasi flies (host race Prunus) in combination with a preliminary phenological model.

Kovanci OB, Kovanci B - J. Insect Sci. (2006)

Bottom Line: Levels of cherry fruit fly fruit damage were very low (0.1%) in commercial orchards, whereas infestation rates averaged 2.2% in reduced-risk orchards.In the reduced-risk backyard orchards, the first flies were captured between 25 May and 2 June, corresponding to an average degree-day (DD) accumulation of 582.50 +/- 10.50 DD at an altitude of 150 m.Our prediction model suggests that the optimum spray-window for a single insecticide application occurs between 577.70 and 639.40 DD at 150 m and between 780.90 and 848.60 DD at 1170 m.

View Article: PubMed Central - PubMed

Affiliation: Uludag University, Faculty of Agriculture, Department of Plant Protection, Gorukle 16059 Bursa TURKEY.

ABSTRACT
Seasonal flight activity of Rhagoletis cerasi (L.) (Diptera: Tephritidae) adults was monitored using yellow sticky traps at sweet cherry orchards under different management regimes in Bursa, northwestern Turkey, during 1997-1998. In the reduced-risk backyard orchards, soil ploughing in the fall or spring to destroy the pupae was combined with a single application of an insecticide, while conventionally managed orchards received six to seven insecticide applications for controlling adults. Traps in commercial orchards caught significantly fewer adults than those in reduced-risk backyard orchards. Levels of cherry fruit fly fruit damage were very low (0.1%) in commercial orchards, whereas infestation rates averaged 2.2% in reduced-risk orchards. A preliminary phenology model was developed for optimal timing of insecticide applications based on air temperature summations since 1 February. In the reduced-risk backyard orchards, the first flies were captured between 25 May and 2 June, corresponding to an average degree-day (DD) accumulation of 582.50 +/- 10.50 DD at an altitude of 150 m. However, first adult emergence at 1170 m was recorded between 6 and 14 June, averaging 667.50 +/- 14.50 DD. Adult emergence exhibited bimodal peaks in a single flight at low altitude but there was a single peak at high altitude sites. Total adult flight period averaged 459 +/- 29.50 and 649 +/- 25.50 DD at low and high altitude sites, respectively. Our prediction model suggests that the optimum spray-window for a single insecticide application occurs between 577.70 and 639.40 DD at 150 m and between 780.90 and 848.60 DD at 1170 m.

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Relationship between probit transformation of the cumulative percentage of Rhagoletis cerasi flies caught in yellow sticky traps and degree-day accumulations above 7°C since 1 February in reduced-risk orchards at a) Doburca and b) Sogukpinar in 1997 and 1998 (Bursa, Turkey).
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f03: Relationship between probit transformation of the cumulative percentage of Rhagoletis cerasi flies caught in yellow sticky traps and degree-day accumulations above 7°C since 1 February in reduced-risk orchards at a) Doburca and b) Sogukpinar in 1997 and 1998 (Bursa, Turkey).

Mentions: When DD accumulations for both years were combined separately for each location, linear model predictions gave a good fit to the actual trap catches (Figure 3). The model predictions for the mean DD accumulation values corresponding to 10, 25, 50 and 75% of actual trap catches are summarized in Table 3. The differences between the DD predictions and the observed values ranged from 1 to 2 days. For example, the accumulated DD values for 10% of trap catches in Doburca was predicted at 578 DD and actual mean 10% catch occurred at 572 DD when averaged across years, indicating a highly accurate predictive model. Similarly, the observed and predicted dates of 10% adult emergence at Sogukpinar were similar, 766 and 781 DD, respectively.


Reduced-risk management of Rhagoletis cerasi flies (host race Prunus) in combination with a preliminary phenological model.

Kovanci OB, Kovanci B - J. Insect Sci. (2006)

Relationship between probit transformation of the cumulative percentage of Rhagoletis cerasi flies caught in yellow sticky traps and degree-day accumulations above 7°C since 1 February in reduced-risk orchards at a) Doburca and b) Sogukpinar in 1997 and 1998 (Bursa, Turkey).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2990315&req=5

f03: Relationship between probit transformation of the cumulative percentage of Rhagoletis cerasi flies caught in yellow sticky traps and degree-day accumulations above 7°C since 1 February in reduced-risk orchards at a) Doburca and b) Sogukpinar in 1997 and 1998 (Bursa, Turkey).
Mentions: When DD accumulations for both years were combined separately for each location, linear model predictions gave a good fit to the actual trap catches (Figure 3). The model predictions for the mean DD accumulation values corresponding to 10, 25, 50 and 75% of actual trap catches are summarized in Table 3. The differences between the DD predictions and the observed values ranged from 1 to 2 days. For example, the accumulated DD values for 10% of trap catches in Doburca was predicted at 578 DD and actual mean 10% catch occurred at 572 DD when averaged across years, indicating a highly accurate predictive model. Similarly, the observed and predicted dates of 10% adult emergence at Sogukpinar were similar, 766 and 781 DD, respectively.

Bottom Line: Levels of cherry fruit fly fruit damage were very low (0.1%) in commercial orchards, whereas infestation rates averaged 2.2% in reduced-risk orchards.In the reduced-risk backyard orchards, the first flies were captured between 25 May and 2 June, corresponding to an average degree-day (DD) accumulation of 582.50 +/- 10.50 DD at an altitude of 150 m.Our prediction model suggests that the optimum spray-window for a single insecticide application occurs between 577.70 and 639.40 DD at 150 m and between 780.90 and 848.60 DD at 1170 m.

View Article: PubMed Central - PubMed

Affiliation: Uludag University, Faculty of Agriculture, Department of Plant Protection, Gorukle 16059 Bursa TURKEY.

ABSTRACT
Seasonal flight activity of Rhagoletis cerasi (L.) (Diptera: Tephritidae) adults was monitored using yellow sticky traps at sweet cherry orchards under different management regimes in Bursa, northwestern Turkey, during 1997-1998. In the reduced-risk backyard orchards, soil ploughing in the fall or spring to destroy the pupae was combined with a single application of an insecticide, while conventionally managed orchards received six to seven insecticide applications for controlling adults. Traps in commercial orchards caught significantly fewer adults than those in reduced-risk backyard orchards. Levels of cherry fruit fly fruit damage were very low (0.1%) in commercial orchards, whereas infestation rates averaged 2.2% in reduced-risk orchards. A preliminary phenology model was developed for optimal timing of insecticide applications based on air temperature summations since 1 February. In the reduced-risk backyard orchards, the first flies were captured between 25 May and 2 June, corresponding to an average degree-day (DD) accumulation of 582.50 +/- 10.50 DD at an altitude of 150 m. However, first adult emergence at 1170 m was recorded between 6 and 14 June, averaging 667.50 +/- 14.50 DD. Adult emergence exhibited bimodal peaks in a single flight at low altitude but there was a single peak at high altitude sites. Total adult flight period averaged 459 +/- 29.50 and 649 +/- 25.50 DD at low and high altitude sites, respectively. Our prediction model suggests that the optimum spray-window for a single insecticide application occurs between 577.70 and 639.40 DD at 150 m and between 780.90 and 848.60 DD at 1170 m.

Show MeSH
Related in: MedlinePlus