Manipulation of Tritrophic Interactions for IPM. Tri-trophic Interaction Plants Herbivores Predator/parasitoids.

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Presentation transcript:

Manipulation of Tritrophic Interactions for IPM

Tri-trophic Interaction Plants Herbivores Predator/parasitoids

Plants Interact With the Third Trophic Level Chemically Morphologically Chemically Morphologically

Multi-trophic interactions Plants Herbivores Predator/parasitoids Hyperparasitoid

The Slow Growth High Mortality Hypothesis

Feeding on sub-optimal food produces an increase in insect herbivore developmental time.

Increased developmental time in herbivores may increase vulnerability to natural enemies

The Slow-Growth-High-Mortality Hypothesis Prolonged larval development of herbivores results in greater vulnerability and thus greater mortality due to natural enemies. (Clancy and Price 1987).

Tests Have Produced Mixed Results Support: - Free feeding herbivores. - Feeding on same or related plant species. Fail: - Concealed feeding herbivores. - Feeding on unrelated plant species.

G.lineola - Predators attack more on S.dasyclados - Develop longer on S.sasyclados P.rapae M.disstria - Develop longer on low N collards - Predators attack more on low N collards - Develop longer on late budbreaks - Predators attack more on late budtbreaks Studies Supporting the Hypothesis

Which Natural Enemies Have Been Considered to Test the Hypothesis? Suite of predators. Single parasitoid species. Parasitoid community.

Acer negundo Salix nigra Orgyia leucostigma

Experimental Protocol Rear O. leucostigma on willow and box elder. Measure development time and adult mass on willow and box elder. Use 7-year data base to determine percent parasitism of O.leucostigma on willow and box elder.

O. leucostigma developed faster on willow P<0.0001

Female O.leucostigma on willow were heavier than on box elder. F F MM aa b c

Family Parasitoid species Overall percent parasitism on Box elder Willow 1. X 2 = 11.83; P<0.001 Percent Parasitism of O.leucostigma on two tree species

In Summary O. leucostigma developed faster in willow than in box elder. Overall parasitism in O.leucostigma was greater in willow than in box elder.

Conclusion The slow-growth-high-mortality hypothesis does not hold for O. leucostigma and its parasitoid community.

Conclusion On a free feeding herbivore feeding on unrelated species. Support: - One parasitoid species considered. Fail: - A community of parasitoids considered.

Conclusion The effect of host plant quality on individual species of natural enemies might differ significantly from the effect of host plant quality on the natural enemy community.

Differential susceptibility of herbivores to natural enemies