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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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Five day average temperatures and total precipitation at a) Doburca and b) Sogukpinar during February-July in 1997 and 1998 (Bursa, Turkey).
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f01: Five day average temperatures and total precipitation at a) Doburca and b) Sogukpinar during February-July in 1997 and 1998 (Bursa, Turkey).

Mentions: Figure 1 shows the five day average temperatures and total precipitation in Doburca (Bursa plain) and Sogukpinar (Mt. Uludag) during the study period. The data were obtained from two national weather service stations in Bursa: (i) Hurriyet (100 m, 40.18°N 29.00°E) and (ii) Mount Uludag (1025 m, 40.10°N 29.20°E). Both stations are 1 km from the experimental areas. Based on the equation of Baskerville and Emin (1969), daily maximum and minimum air temperatures were used to calculate DDs above a developmental threshold of 7°C starting from 1 February (Leski 1963). The starting date of 1 February for the accumulation of DD was chosen because earlier experiments had shown that diapause termination in pupae occurred in the first week of February (Feron 1952).


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)

Five day average temperatures and total precipitation at a) Doburca and b) Sogukpinar during February-July in 1997 and 1998 (Bursa, Turkey).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f01: Five day average temperatures and total precipitation at a) Doburca and b) Sogukpinar during February-July in 1997 and 1998 (Bursa, Turkey).
Mentions: Figure 1 shows the five day average temperatures and total precipitation in Doburca (Bursa plain) and Sogukpinar (Mt. Uludag) during the study period. The data were obtained from two national weather service stations in Bursa: (i) Hurriyet (100 m, 40.18°N 29.00°E) and (ii) Mount Uludag (1025 m, 40.10°N 29.20°E). Both stations are 1 km from the experimental areas. Based on the equation of Baskerville and Emin (1969), daily maximum and minimum air temperatures were used to calculate DDs above a developmental threshold of 7°C starting from 1 February (Leski 1963). The starting date of 1 February for the accumulation of DD was chosen because earlier experiments had shown that diapause termination in pupae occurred in the first week of February (Feron 1952).

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