Agricultural and Forest Entomology (2007) 9, 271-278

Marc Sporleder, Erica Maritza Rodriguez Cauti, Jürg Huber and Jürgen Kroschel (2007)
Susceptibility of Phthorimaea operculella Zeller (Lepidoptera; Gelechiidae) to its granulovirus PoGV with larval age
Agricultural and Forest Entomology 9 (4), 271-278
Abstract: 1 Granulovirus PoGV is a strong candidate to substitute for chemical insecticides in integrated pest management (IPM) of the potato tuber moth Phthorimaea operculella Zeller (Lepidoptera: Gelechiidae). Generally, susceptibility to baculoviruses decreases with increasing larval age. For effective field applications, knowledge of the age-related change in susceptibility is crucial.
2 The relative susceptibility of various instars of P. operculella larvae to PoGV was studied by leaf-disc bioassays in the laboratory at 26 °C incubation temperature. The LC50 increased from 4 × 10⁶ granules/mL for neonate larvae to 1.2 × 10⁷, 1.1 × 10⁸, 4.4 × 10⁸, and 4.2 × 10⁹ granules/mL, signifying resistance ratios of 3, 29, 110, and 1051, for 5, 6, 7, and 9-day-old larvae, respectively.
3 The relationship between log-LC50 values and log-larval weight was significantly linear. A logistic function described significantly the relation between larval weights and physiological age measured in degree-days (DD > 13.4 °C). Both functions allowed prediction of the activity ratio of PoGV for different larval ages by using temperature summation to express physiological age.
4 PoGV was found to be highly active against P. operculella larvae up to a physiological age of approximately 50 DD (>13.4 °C) (i.e. the first third of the total larval development time). Thereafter, the virus rapidly lost its activity against older larvae. Prospects for applying this knowledge in the field are discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Marc Sporleder, Jürg Huber, Jürgen Kroschel

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phthorimaea operculella
Betabaculovirus phoperculellae (entomopathogen)	Phthorimaea operculella