Comparison of three management schemes for Colorado potato beetle on early-season potatoes in Prince Edward Island

The economics of managing the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae) on potatoes (Solarium tuberosum) with different strategies was tested at four sites on Prince-Edward-Island in 1989. Three treatments were tested at each site: 1) an untreated check, 2) an application of Bacillus thuringiensis var. tenebrionis or rotenone after a threshold of 0.5 Colorado Potato Beetle Equivalents (CPBE) per stalk was reached ( 1 CPBE = 1 spring adult, 8 first- or second- instar larvae, 3 third- or fourth- instar larvae, or 1.6 summer adults), and 3) applications of insecticide according to the grower's normal spray schedule. At one site, tuber yield of plots managed with the 0.5 CPBE-per-stalk threshold was similar to that of plots where the grower maintained his normal spray schedule, but three fewer applications of insecticides were needed in the former. At the remaining sites, where the density of Colorado potato beetles did not exceed the threshold, tuber yield was similar to that of the grower's plots. This suggests that there were needless applications of insecticides by the growers.

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Mortality of Colorado Potato Beetle (Leptinotarsa decemlineata) after Sublethal Stress with the CryIIIA δ-Endotoxin of Bacillus thuringiensis and Subsequent Exposure to Beauveria bassiana

Journal of Invertebrate Pathology ◽

10.1006/jipa.2001.5017 ◽

2001 ◽

Vol 77 (3) ◽

pp. 173-179 ◽

Cited By ~ 17

Author(s):

Scott D Costa ◽

Mary E Barbercheck ◽

George G Kennedy

Keyword(s):

Bacillus Thuringiensis ◽

Beauveria Bassiana ◽

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Potato Beetle ◽

Sublethal Stress ◽

Subsequent Exposure

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INCIDENCE OF INSECTICIDE RESISTANCE IN POPULATIONS OF COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA (SAY) (COLEOPTERA: CHRYSOMELIDAE), ON PRINCE EDWARD ISLAND

The Canadian Entomologist ◽

10.4039/ent12921-1 ◽

1997 ◽

Vol 129 (1) ◽

pp. 21-26 ◽

Cited By ~ 22

Author(s):

Jeff G. Stewart ◽

George G. Kennedy ◽

Antony V. Sturz

Keyword(s):

Insecticide Resistance ◽

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Prince Edward Island ◽

Potato Beetle ◽

Azinphos Methyl ◽

Leptinotarsa Decemlineata Say

AbstractA survey of 65 populations of Colorado potato beetle, Leptinotarsa decemlineata (Say), from locations across Prince Edward Island in 1993 indicated that insecticide resistance was widespread, but was most prevalent in the western and central potato-producing areas. Of the populations surveyed, 31, 26, 19, and 4% were classified as resistant to permethrin, carbofuran, azinphos-methyl, and endosulfan, respectively. Of 53 populations surveyed for resistance to these four insecticides, 13, six, four, and one of the populations were classified as resistant to one, two, three, and four insecticides, respectively.

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COLORADO POTATO BEETLE CONTROL WITH CYROMAZINE

HortScience ◽

10.21273/hortsci.27.6.628e ◽

1992 ◽

Vol 27 (6) ◽

pp. 628e-628 ◽

Cited By ~ 1

Author(s):

J.D. Abbott ◽

L. T. Thetford

Keyword(s):

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Total Yield ◽

Insect Growth Regulator ◽

Insect Feeding ◽

Potato Leaf ◽

Egg Hatch ◽

Potato Beetle ◽

Untreated Check ◽

Small Plot

Cyromazine is a triazine molecule with insect growth regulator properties being developed for control of Colorado potato beetle (Leptinotarsa decemlineata Say) (CPB) in vegetables. Research presented focuses primarily on results with potato (Solanum tuberosum L.), however, crop safety has been observed in other crops within the Solanaceae. Several trials were conducted in PA and NY during 1991 to examine the rates and timing necessary to control CPB in potatoes. Data from replicated small plot trials and non-replicated large block trials are included. Rates examined ranged 70 to 560 g ai na-1 applied alone or in combination with a pyrethroid or Bt. Comparisons were made with insecticides presently registered for CPB control in potatoes and cyromazine compared quite favorably. Two applications per CPB generation were made, the first at the beginning of CPB egg hatch and a second 7-16 days later for each generation. This application schedule provided excellent (90%) control of CPB larvae. The reduction in larvae also resulted in a reduction in adult CPB and potato leaf area damaged through insect feeding. In the test conducted in PA, an increase in size and number of tubers was observed when plants were treated with cyromazine. -These increases resulted in a 23-28% increase in total yield compared to that obtained from the untreated check plots.

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Consumption of Eggplant Foliage by Colorado Potato Beetle (Coleoptera: Chrysomelidae)

Journal of Entomological Science ◽

10.18474/0749-8004-31.2.191 ◽

1996 ◽

Vol 31 (2) ◽

pp. 191-198 ◽

Cited By ~ 1

Author(s):

Salvatore Arpaia ◽

James Lashomb ◽

George C. Hamilton ◽

Karen Vail

Keyword(s):

Linear Relationship ◽

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Life Stage ◽

Fourth Instar ◽

Field Sampling ◽

Sampling Plans ◽

Potato Beetle ◽

Leptinotarsa Decemlineata Say ◽

Effects Of Temperature

Feeding of second- to fourth-instar Colorado potato beetle, Leptinotarsa decemlineata Say, on eggplant was monitored at constant temperatures of 20, 26, 29, 32 and 35° C, and at 16, 20, 27, 29, and 33° C for adults to determine the effects of temperature on consumption. For comparison, consumption by each stage relative to fourth instars was standardized to feeding equivalants. A significant non-linear relationship was found between temperature and consumption for each life stage tested. Placement of each life stage on an equivalent feeding basis showed second instars consume on average 21.5% as much foliage as fourth instars, third instars 51.2% the amount of fourth instars, and adults 39.0% the level of fourth instars. These feeding equivalents can be used to develop field sampling plans and toxicant bioassays.

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MANAGEMENT OF LATE-SEASON ADULTS OF THE COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE) WITH ENTOMOPATHOGENIC NEMATODES

The Canadian Entomologist ◽

10.4039/ent130509-4 ◽

1998 ◽

Vol 130 (4) ◽

pp. 509-514 ◽

Cited By ~ 10

Author(s):

Jeff G. Stewart ◽

Gilles Boiteau ◽

Joe Kimpinski

Keyword(s):

New Brunswick ◽

Colorado Potato Beetle ◽

Prince Edward Island ◽

Entomopathogenic Nematodes ◽

Field Trials ◽

Steinernema Carpocapsae ◽

Laboratory Conditions ◽

Potato Beetle ◽

Untreated Check ◽

Repeated Applications

AbstractThe susceptibility of Colorado potato beetle [Leptinotarsa decemlineata (Say), Coleoptera: Chrysomelidae] to entomopathogenic nematodes (Steinernema carpocapsae, ’All’ strain, Nematoda: Heterorhabditae) was tested in the laboratory and the field in 1992 and 1993. Under laboratory conditions, applications of 5.0 × 105S. carpocapsae per square metre to larvae, pupae, and (or) adults resulted in 100% mortality in all experimental groups. Steinernema carpocapsae persisted through the larval–pupal and pupal–adult transitions. A single application of nematodes was sufficient to control the Colorado potato beetle. The following treatments were tested at field sites in New Brunswick and Prince Edward Island: (i) untreated check, (ii) application of nematodes, or (iii) application of insecticides. Straw mulch was either present or absent in each treatment. In 1992 in New Brunswick, nematodes and fenvalerate reduced Colorado potato beetle populations by 31% compared with the untreated check. However, in 1993, differences among treatments were not significant. The results from the field trials in Prince Edward Island were variable; the life expectancy of nematodes is likely shorter in the field than under laboratory conditions. Further investigation into the benefits of repeated applications of nematodes, higher rates, or improvements in application technology are required to achieve consistent control of the Colorado potato beetle.

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DIFLUBENZURON: DIFFERENTIAL TOXICITY TO LARVAE OF THE COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE) AND ITS INTERNAL PARASITE, DORYPHOROPHAGA DORYPHORAE (DIPTERA: TACHINIDAE)

The Canadian Entomologist ◽

10.4039/ent116197-2 ◽

1984 ◽

Vol 116 (2) ◽

pp. 197-202 ◽

Cited By ~ 6

Author(s):

George Tamaki ◽

R. L. Chauvin ◽

H. R. Moffitt ◽

K. D. Mantey

Keyword(s):

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Fourth Instar ◽

Internal Parasite ◽

Potato Beetle ◽

Differential Toxicity ◽

Parasite Survival ◽

Potato Foliage ◽

Tachinid Parasite ◽

Greenhouse Tests

AbstractAn insecticide, diflubenzuron, suppressed 3rd- and 4th-instar larvae of the Colorado potato beetle, Leptinotarsa decemlineata (Say), with reduced effect on the tachinid parasite, Doryphorophaga doryphorae (Riley), developing within the larvae. Concentrations applied to potato foliage were 50, 100, 300, and 500 mg/L. In laboratory and greenhouse tests, parasite survival was not adversely affected when the 3rd instars were treated with 50 mg/L diflubenzuron but survival decreased to 0 and 4% at 300 and 500 mg/L. Survival and emergence of the parasite from treated 4th instars were not adversely affected at any concentration tested. Fourth-instar beetle larvae were much more tolerant of diflubenzuron than were the 3rd instars. Neither fertility nor the ability to parasitize beetle larvae was adversely affected in adult parasites emerging from treated 3rd or 4th instars. Adult beetles developing from treated larvae mated normally and laid fertile eggs. Foliage consumption by the beetle larvae decreased progressively as dosage of diflubenzuron increased but only slowly once the dosage increased beyond 100 mg/L.

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