Mortality of Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) by Gamma Irradiation

Abstract

A B S T R A C TThe western flower thrips, Frankliniella occidentalis (Pergande), is a good working model for studies of irradiation as a quarantine treatment on agricultural products against this insect group. A study was conducted to evaluate the mortality of this species, resulting from different dosages of gamma irradiation. Field populations were collected and exposed to 0.5, 1.0, and 1.5 kGy in a 60-Cobalt irradiator. In a first experiment, 645 adult F. occidentalis per treatment were used. Adult mortality reached 35% to 67% after 1 h exposure, significantly higher than the control. In a second experiment with the same dosages and storage at 5-6°C, evaluations were done at days 8 and 14 on at least 200 adults. Mortality increased significantly with the dosage of irradiation over time, and reached 95% with the higher dosage. In general, there were no differences between 8 and 14 days under cold storage for a given dosage. From a quarantine point of view, it is suggested to evaluate the combined effect of higher irradiation dosages and colder storage, as well as the effects of the treatments on fertility and fecundity of thrips.

Effects of gamma radiation on the survival of four species of thrips (Thysanoptera: Thripidae)

“…Frankliniella occidentalis (Pergande) were effectively sterilised at 300 Gy by Araya et al . () and Koo et al . (), the latter when placed in boxes of cut flowers.…”

“…Adult Frankliniella schultzei (Trybom) (tomato thrips) sterility was reported to occur at 250 Gy (Yalemar et al 2001). Frankliniella occidentalis (Pergande) were effectively sterilised at 300 Gy by Araya et al (2007) and Koo et al (2017), the latter when placed in boxes of cut flowers. Frankliniella occidentalis (Pergande) were effectively sterilised at 300 Gy by Araya et al (2007) and Koo et al (2017), the latter when placed in boxes of cut flowers.…”

“…Thrips palmi Karny were found to produce only infertile eggs at 350 ± 30 Gy (Bansddhi et al 2004). Frankliniella occidentalis (Pergande) were effectively sterilised at 300 Gy by Araya et al (2007) and Koo et al (2017), the latter when placed in boxes of cut flowers.…”

A Preliminary Review of the Flower Thrips Frankliniella Karny (Thysanoptera: Thripidae) with Taxonomic Updates and Description of Five New Species

“…Frankliniella venusta Moulton 1936: 172. Revised status. Diagnosis.-Synonymized with F. occi dentalis evidenced by color and morphometrics (Bryan and Smith 1956), F. venusta is considered here to be a valid species. The dark femora and body of F. venusta distinctly contrast compared to the paler foretibia, tarsi and distal 0.25 of the middle tibiae (Fig.…”

Lista preliminar de trips en plantas ornamentales y malezas en la Región de La Araucanía, Chile

“…Este tisanóptero ha sido estudiado en Chile en cuanto a su morfología (Quintanilla, 1984), distribución (González, 1999), biología (González, 1995;González & Barría, 1999) y manejo (González, 1983;Prado, 1991b;González, 2001;Ripa et al, 2001;Vargas & Ubillo, 2005;Larraín et al, 2006;Araya et al, 2007); sin embargo, existen pocos trabajos referentes a asociación con sus hospederos. Particularmente para La Araucanía no se conoce la presencia de especies de trips asociadas a sus hospederos especialmente en plantas ornamentales y malezas, siendo el objetivo de este trabajo dar a conocer las especies presentes en ellas.…”