Skip to main content

Susceptibility of Phthorimaea operculella Zeller (Lepidoptera; Gelechiidae) to its granulovirus PoGV with larval age

Buy Article:

$51.00 plus tax (Refund Policy)



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.

Keywords: Age-related suceptibility; baculovirus; biological control; insect pathogens; microbial control; potato tuber moth

Document Type: Research Article


Affiliations: Institute of Biological Control, Federal Biological Research Center for Agriculture and Forestry (BBA), Heinrichstrasse 243, D-64287 Darmstadt, Germany

Publication date: November 1, 2007


Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more