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This research took place in the Province of Velez in Santander, Colombia (5° 33’ – 5°88’ N and 73° 42’ – 73° 48’ W)   in the municipalities of Guavata, Puente Nacional and Jesus Maria (1.650 – 1.890 masl, 17,8° C; 1800- 2500 ml of  rain/year; 93% of HR) in crops of Psidium guajava L. and Coffea arabica L. The objective was to identify and measure the crop damage caused by fruit flies on both species. Sampling was carried out for two years. Samples of mature fruits from each host plant were monthly taken from the trees, in three plots per location. Fruits were separately evaluated for the presence of larvae. The number of third instar larvae (L3), pupae and adults per sample was registered by species and sex. A total of 216 samples were analyzed per host plant which corresponded to 217, 42 kg of guava and 213,75 kg of coffee. Results indicated the presence of Anastrepha striata Schiner and A. fraterculus (Wied) emerging from guava and coffee. The attack proportion in guava was 91,72% caused by A. striataand only 8,26% caused by A. fraterculus. In coffee A. striata caused 0,85% of the attack while A. fraterculus caused 99,15% of the attack. Male: female ratio was 1:1 for both species. Average percent of total damage per year was 99,86% in 2000 and of 96,20% in 2001 for guava; no statistical differences within years were found. The infestation index [L3/kg of fruit] was 153.3 in the first year and 214,9 in the second year, significant differences among years and localities were found. Percentage of fruit damage was lower in coffee when compared to guava (18,93% in the first year and 22,23% in the second). The infestation [L3/kg] in the first year was 110,6 and 120,83 in the second (P>0.05).

ciencia y tecnología agropecuaria

Moscas de las frutas (Díptera: Tephritidae) y parasitoides asociados con Psidium guajava L. y Coffea arabica L. en tres municipios de la Provincia de Vélez (Santander, Colombia). Parte 1: Índices de infestación y daño por moscas de la frutas