The extract showed no olfactory repellency.

botanical · Leptinotarsa decemlineata · Solanum tuberosum (potato)Positive and negative results

4 papers in the same direction as this claim · 15 in the opposite direction

1. positive
   Neem and Bacillus thuringiensis had additive larval mortality in the susceptible strain.

   Toxicity of Neem Applied Alone and in Combinations with Bacillus thuringiensis to Colorado Potato Beetle (Coleoptera: Chrysomelidae) · 1999

   Opposite direction

2. positive
   Neem extract at three concentrations inhibited adult and larval feeding on potato foliage.

   Feeding Inhibition and Mortality Effects of Neem-Seed Extract on the Colorado Potato Beetle (Coleoptera: Chrysomelidae) · 1988

   Opposite direction

3. positive
   At 20 g kg(-1), extracts of Arctium, Bifora, Humulus and Xanthium left significantly more potato leaf tissue than untreated controls.

   Behavioural response of Colorado potato beetle ( Leptinotarsa decemlineata ) larvae to selected plant extracts · 2006 · compared with untreated control leaves

   Opposite direction

4. positive
   Neem products decreased Colorado potato beetle feeding.

   Fitness reduction and mortality effects of neem‐based pesticides on the Colorado potato beetle Leptinotarsa decemlineata Say (Col., Chrysomelidae) · 1992

   Opposite direction

5. positive
   T. parthenium oil was more effective against beetle larvae.

   Repellent activity of Tanacetum parthenium (L.) and Tanacetum vulgare (L.) essential oils against Leptinotarsa decemlineata (Say) · 2020 · compared with T. vulgare

   Opposite direction

6. positive
   H. lupulus extract at 10 g/L gave the greatest antifeedant activity; consumed area was 0.68 cm2 after 72 h.

   Antifeedant activity and growth inhibition effects of some plant extracts against larvae of Colorado potato beetle [Leptinotarsa decemlineata Say (Col: Chyrsomelidae)] under laboratory conditions · 2015

   Opposite direction

7. positive
   White oak leaf and bark alcohol extracts inhibited Colorado potato beetle feeding on treated potato leaves.

   Effect of White Oak Extracts on Feeding by the Colorado Potato Beetle (Coleoptera: Chrysomelidae) · 1985

   Opposite direction

8. positive
   Fourth-instar Colorado potato beetle larvae fed potato leaves coated with flower methanol extract (10 mg/mL) had a significantly lower final body mass (157.67 mg) than controls (182.26 mg).

   UHPLC-OrbiTrap MS Characterization of Phenolic Profiles in French Marigold Extracts and Analysis of Their Antifeedant Activity against Colorado Potato Beetle · 2022 · compared with controls fed with non-treated leaves

   Opposite direction

11 papers more in this group