Colorado Potato Beetle Resistance in Solanum oplocense X Solanum tuberosum Intercross Hybrids and Metabolite Markers for Selection

AbstractPitfall and screen traps were used around potato Solanum tuberosum L. (Solanaceae) plots to detect directional patterns of prediapause (two seasons) and postdiapause (one season) movement in a univoltine population of the Colorado potato beetle, Leptinotarsa decemlineata (Say), from Quebec. Prediapause beetles were sampled for diapause readiness using a feeding–digging test. In 1994, a plot left unprotected from the beetle (moderately defoliated) was monitored. In 1995, movement around a plot left unprotected from the beetle (severely defoliated) was compared to that from a plot protected (only lightly defoliated) by inundative release of the potato beetle predator Perillus bioculatus Say (Hemiptera: Pentatomidae). Movement frequency by postdiapause beetles in spring 1995 was low compared with 1994 prediapause movement, especially on the ground. Low-frequency flying persisted over several weeks of postdiapause beetle oviposition, with only a brief period of directionality. Flight movement by satiated prediapause beetles in August 1994 and 1995 was strongly directional, being oriented toward the closest forest border east of the plots, where sampling confirmed overwintering. In both years, satiated prediapause beetles also emigrated by walking, but mostly from densely populated and defoliated plots. Newly emerged (unsatiated) prediapause beetles emigrated en masse from severely defoliated plants, and did so exclusively by walking. Directional walking contrasted with directional flying in being predominantly oriented south-westward to northwestward, suggesting cueing on the sun position during warm hours of the day.

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OVERWINTERING DENSITIES AND SURVIVAL OF THE COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE) IN AND AROUND TOMATO (SOLANACEAE) FIELDS

The Canadian Entomologist ◽

10.4039/ent132103-1 ◽

2000 ◽

Vol 132 (1) ◽

pp. 103-105 ◽

Cited By ~ 5

Author(s):

D.W.A. Hunt ◽

C.S. Tan

Keyword(s):

Solanum Tuberosum ◽

New Jersey ◽

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Soil Depth ◽

Winter Mortality ◽

Potato Beetle ◽

Large Numbers ◽

Overwintering Mortality

The Colorado potato beetle, Leptinotarsa decemlineata (Say), overwinters in the soil as a diapausing adult. Large numbers of adult beetles fly and walk from potato, Solanum tuberosum L. (Solanaceae), fields to the surrounding forested edges late in the summer (Voss and Ferro 1990). This movement can result in higher densities of diapausing adults in the soil along these edges than in potato fields (Weber and Ferro 1993). Beetles that overwinter in these woody borders show lower levels of overwintering mortality (Weber et al. 1994). Survivorship of overwintering Colorado potato beetle adults was positively correlated with soil depth for studies conducted adjacent to potato fields in New Jersey (Lashomb et al. 1984) and Massachusetts (Weber and Ferro 1993). Lashomb et al. (1984) reported that a 10-cm increase in soil depth decreased winter mortality by 32%.

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The effect of light intensity on Colorado potato beetle resistance and foliar glycoalkaloid concentration of fourSolanum chacoense clones

American Potato Journal ◽

10.1007/bf02853741 ◽

1991 ◽

Vol 68 (10) ◽

pp. 659-666 ◽

Cited By ~ 24

Author(s):

K. L. Deahl ◽

W. W. Cantelo ◽

S. L. Sinden ◽

L. L. Sanford

Keyword(s):

Light Intensity ◽

Colorado Potato Beetle ◽

Potato Beetle ◽

Colorado Potato Beetle Resistance ◽

Effect Of Light

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Effect of α-Tomatine and Tomatidine on the Growth and Development of the Colorado Potato Beetle (Coleoptera: Chrysomelidae): Studies Using Synthetic Diets

Journal of Entomological Science ◽

10.18474/0749-8004-35.3.290 ◽

2000 ◽

Vol 35 (3) ◽

pp. 290-300 ◽

Cited By ~ 12

Author(s):

Stanley P. Kowalski ◽

John M. Domek ◽

Lind L. Sanford ◽

Kenneth L. Deahl

Keyword(s):

Mechanism Of Action ◽

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Growth And Development ◽

In Planta ◽

Prepupal Stage ◽

Resistance Factors ◽

Potato Beetle ◽

Leptinotarsa Decemlineata Say ◽

Colorado Potato Beetle Resistance

Glycoalkaloids are found throughout the genera Solanum (potato) and Lycopersicon (tomato). Certain glycoalkaloids, i.e., α-tomatine, solanocardenine, and leptine, have been implicated as resistance factors to the Colorado potato beetle, Leptinotarsa decemlineata Say. The allelochemical properties of these glycoalkaloids have primarily been demonstrated by studies in planta, correlating Colorado potato beetle resistance with high levels of foliar glycoalkaloids: solanocardenine in S. neocardenasii, α-tomatine in S. pinnatisectum, and leptine in S. chacoense. Although the evidence that these glycoalkaloids mediate resistance is compelling, controlled analyses of Colorado potato beetle response to purified glycoalkaloids, fed to insects in synthetic diets, are necessary to characterize the allelochemic nature of these compounds. In this study, Colorado potato beetle reared on a meridic, synthetic diet supplemented with increasing concentrations of α-tomatine exhibit retarded growth and delayed development. These effects were evident throughout the insects' development, from egg to prepupal stage. Tomatidine (the aglycone of α-tomatine) has no effect on Colorado potato beetle, suggesting that the tetrasaccharide moiety of the glycoalkaloid is essential for insecticidal activity, consistent with a membrane-lytic mechanism of action.

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