SEASONAL AND HOST PLANT EFFECTS ON PARASITISM OF COLORADO POTATO BEETLE BY <i>MYIOPHARUS DORYPHORAE</i> (RILEY) (DIPTERA: TACHINIDAE)

Horton, David; Capinera, John L.

doi:10.4039/ent119729-7

Cited by 13 publications

(3 citation statements)

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“…tenebrionis foliar sprays in the laboratory (Whalon et al., 1993). Researchers are examining regulation of the CPB with biological controls, using predators and parasites (Hough‐Goldstein et al., 1993), including the CPB prepupal parasite Myiopharus doryphorae (Riley) (Diptera: Tachinidae), which is common through much of the potato‐growing regions of the USA (Tamaki et al., 1983; Horton & Capinera, 1987; Lopez et al., 1995). However, the tachinid often only provides high levels of CPB control late in the season, so other researchers are also examining pathogens (Lacey et al., 1999) for reducing CPB populations.…”

Section: Introductionmentioning

confidence: 99%

Colorado potato beetle control by application of the entomopathogenic nematode Heterorhabditis marelata and potato plant alkaloid manipulation

Armer

Berry

Reed³

et al. 2004

Entomologia Exp Applicata

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Control of the Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), with the entomopathogenic nematode Heterorhabditis marelata Liu and Berry (Nematoda: Heterorhabditidae) was examined in the laboratory and in potato fields in north central Oregon. This research tested the hypothesis that varying nitrogen fertilizer levels would affect foliar alkaloid levels, which would stress the host, and allow increased nematode reproduction and long-term control of the CPB. Laboratory results indicated that nematodes tended to reproduce more readily in CPB fed on potato plants with high levels of fertilizer. Field trials tested CPB population responses to four treatments: application of nematodes vs. no nematodes, with application of low vs. high rates of nitrogen fertilizer. The higher nitrogen application rate increased field foliar levels of the alkaloids solanine by 35%, and chaconine by 41% over the season. Nematodes were applied twice during the season, causing a 50% reduction in adult CPB populations, and producing six times as many dead prepupae in nematode-treated soil samples as in the untreated samples. However, no reproducing nematodes were found in the 303 dead prepupae and pupae collected from nematode-treated plots. Nitrogen fertilizer levels, and their related alkaloid levels, did not affect nematode infection rates or reproduction in the field. Foliar alkaloid levels of plants from the growth chamber were 3-6-fold as high as those in the field, which may explain the variation in nematode response to nitrogen applications to host plants of the CPB. Heterorhabditis marelata is effective for controlling CPB in the field, and does not have negative non-target effects on one of the most common endemic CPB control agents, Myiopharus doryphorae (Riley) (Diptera: Tachinidae), but the low rate of nematode reproduction cannot be manipulated through alkaloid stress to the beetle. Until H. marelata can be mass-produced in an inexpensive manner, it will not be a commercially viable control for CPB.

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Section: Introductionmentioning

confidence: 99%

Colorado potato beetle control by application of the entomopathogenic nematode Heterorhabditis marelata and potato plant alkaloid manipulation

Armer

Berry

Reed³

et al. 2004

Entomologia Exp Applicata

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“…Quantifying the mortality caused by field populations of predators or parasites is an essential step in the development of management strategies which include the action of natural enemies. Larval predation by Podisus maculiventris (Say) and Perillus bioculatus (F.) and parasitism by Myiopharus doryphorae (Riley) have received attention (Drum-mond et al 1984, Tamaki & Butt 1978, Horton & Capinera 1987, Tamaki et al 1983. However, the impact of endemic predators upon the egg stage of Colorado potato beetle has not yet been quantitatively evaluated.…”

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confidence: 99%

Mortality of Eggs of Colorado Potato Beetle (Coleoptera: Chrysomelidae) from Predation by Coleomegilla maculata (Coleoptera: Coccinellidae)

Hazzard

Ferro

Driesche

et al. 1991

Environmental Entomology

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Mortality to the egg stage of Colorado potato beetle, Leptinotarsa decemlineata(Say), from endemic predators was assessed in unsprayed plots within commercial potato fields in western Massacusetts in 1986 and 1987. Direct measurement of recruitment into the egg stage and of lossesto predation gave estimates of total stage-specific mortality for each generation of Colorado potato beetle and daily mortality rates. Abundance of endemic egg predators was measured through direct observation and trapping. Coleomegilla maculata (DeGeer), a coccinellid, was the most abundant predator and the only one consistently present whenever Colorado potato beetle eggs were in the field. Total mortality to eggs from predation was 39.9% in the second generation of 1986 and 37.8% and 58.1% in the first and second generations of 1987, respectively. Daily mortality rate did not change significantly during large fluctuations in prey density. Results suggest that C. maculata can contribute to the control of both early and late generations of Colorado potato beetle and efforts to conserve this natural enemy will help reduc;:ethe need for chemical control.

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“…The seasonal effect on attack rate was presaged by a similar observation of a seasonal effect on the attack rate of this parasitoid on L.decemlineata (Tamaki et al, 1983b; but see Horton & Capinera, 1987). The reason for the variation in attack rate among groups with different sized (aged) individuals is not clear.…”

Section: Discussionmentioning

confidence: 79%

Family structured patterns of mortality in the false Colorado potato beetle

McCauley

1992

Ecological Entomology

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Abstract. 1. The distribution of mortality within and among groups of immature Leptinotursu juncta (Germar) (Coleoptera: Chrysomelidae) was studied in the field at three points in the life‐cycle in order to test whether the fates of individuals occupying the same host plant were non‐independent. 2. Studies were conducted on eggs subject to cannibalism and predation, on newly hatched larvae subject to predation, and on older larvae subject to parasitism by Myiophurus doryphorue (Riley), a tachinid fly. 3. At all three points in the life‐cycle the variance in group‐specific survivorship rates was demonstrated to be significantly greater than expected when individual deaths are distributed randomly among groups, with standardized variances ranging from 42% to 52% of the maximum possible. 4. A statistically significant positive correlation was shown between the number of individuals in a group and the group‐specific survivorship rate at all three life stages. 5. The distribution of genetic variants within and among groups of larvae showed the groups to be mixtures of full and half siblings, with an average coefficient of genetic relatedness, r, equal to 0.38.

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SEASONAL AND HOST PLANT EFFECTS ON PARASITISM OF COLORADO POTATO BEETLE BY MYIOPHARUS DORYPHORAE (RILEY) (DIPTERA: TACHINIDAE)

Cited by 13 publications

References 13 publications

Colorado potato beetle control by application of the entomopathogenic nematode Heterorhabditis marelata and potato plant alkaloid manipulation

Colorado potato beetle control by application of the entomopathogenic nematode Heterorhabditis marelata and potato plant alkaloid manipulation

Mortality of Eggs of Colorado Potato Beetle (Coleoptera: Chrysomelidae) from Predation by Coleomegilla maculata (Coleoptera: Coccinellidae)

Family structured patterns of mortality in the false Colorado potato beetle

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