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Sammanfattning

A micro-feeding assay was developed for testing small amounts of synthetics and extracts as antifeedants for Hylobius pine weevils. We devised a simple setup consisting of 5 x 5-mm pieces of thin layer chromatography cellulose plates used in pairs for a bioassay involving choice. After application of 1.5 mul solutions and evaporation of the solvent, each plate received a 5 mul aliquot of 1 M sucrose as a feeding stimulant. The test period was 4 h at 25 degreesC with 6 days of starvation before the test, compared to just the 1 day sufficient for twig tests. Deprivation of water for 1 day at 65% RH before the test was critical because it increased feeding but not mortality. The combination of starvation and thirst reduced the relative variance ( coefficient of variation) to below 50%. There was a good correlation of antifeedant activity in the microassay with the activity in a standard twig test. The microassay needs only several mg for a test series, whereas the twig test needs grams

Publicerad i

Journal of Pest Science
2004, volym: 77, nummer: 4, sidor: 191-195
Utgivare: SPRINGER HEIDELBERG

SLU författare

  • Löfqvist, Jan

    • Institutionen för växtvetenskap, Sveriges lantbruksuniversitet

  • Marling, Elisabeth

    • Institutionen för växtvetenskap, Sveriges lantbruksuniversitet

UKÄ forskningsämne

Skogsvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1007/s10340-004-0050-9

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/4553