scholarly journals COLORADO POTATO BEETLE CONTROL WITH CYROMAZINE

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 628e-628 ◽  
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.

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

2005 ◽  
Vol 71 (3) ◽  
pp. 121-127 ◽  
Author(s):  
J.G. Stewart ◽  
A.P. Dornan
Keyword(s):  
Bacillus Thuringiensis ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Prince Edward Island ◽  
Tuber Yield ◽  
Fourth Instar ◽  
Early Season ◽  
Potato Beetle ◽  
Untreated Check ◽  
Management Schemes

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.

scholarly journals AFLP-Based Genetic Linkage Map of the Colorado Potato Beetle Leptinotarsa decemlineata: Sex Chromosomes and a Pyrethroid-Resistance Candidate Gene

Genetics ◽  
2001 ◽  
Vol 158 (2) ◽  
pp. 695-700 ◽  
Author(s):  
David J Hawthorne
Keyword(s):  
Candidate Gene ◽  
Linkage Map ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Genetic Linkage ◽  
Genetic Linkage Map ◽  
Sex Chromosome ◽  
Pyrethroid Resistance ◽  
Codominant Markers ◽  
Potato Beetle

Abstract A genetic linkage map was constructed from an intraspecific cross of the Colorado potato beetle, Leptinotarsa decemlineata. This is an initial step toward mapping the loci that underlie important phenotypes associated with insect adaptation to an agroecosystem. The map was made with 172 AFLP and 10 anonymous codominant markers segregating among 74 backcross (BC1) individuals. Markers were mapped to 18 linkage groups and a subset of the markers with a mean intermarker distance of 11.1 cM is presented. A pyrethroid-resistance candidate gene, LdVssc1, was placed onto the map as well. The sex chromosome was identified by exploiting the XO nature of sex determination in this species using patterns of variation at LdVssc1 and the codominant markers.

Population-associated heterogeneity of the digestive Cys protease complement in Colorado potato beetle, Leptinotarsa decemlineata

2018 ◽  
Vol 106 ◽  
pp. 125-133 ◽  
Author(s):  
Asieh Rasoolizadeh ◽  
Marie-Claire Goulet ◽  
Jean-Frédéric Guay ◽  
Conrad Cloutier ◽  
Dominique Michaud
Keyword(s):  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Potato Beetle

scholarly journals Damage potential and phenology of the Colorado potato beetle [Coleoptera: Chrysomelidae] on potato in southern Alberta

2005 ◽  
Vol 83 (2) ◽  
pp. 89-98 ◽  
Author(s):  
C. Noronha ◽  
G.M. Duke ◽  
M.S. Goettel
Keyword(s):  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Potato Production ◽  
Maximum Density ◽  
The Other ◽  
Damage Potential ◽  
Potato Beetle ◽  
Southern Alberta ◽  
Overwintering Mortality ◽  
Experimental Plots

The phenology and damage potential of the Colorado potato beetle (Leptinotarsa decemlineata) were studied in the potato producing area in southern Alberta. Experimental plots were established at Lethbridge in 1998, 1999 and 2000, and at Vauxhall in 1998 and 1999. At each site, one plot was protected against the beetle by application of insecticides while the other was "unprotected." Natural potato beetle populations quickly colonized unprotected plots each year. Overwintered adults appeared in plots by mid June with mean densities reaching between 0.3 and 0.6 per plant. Eggs were laid on young plants with mean densities reaching two egg masses per plant by late June. Maximum larval densities reached 9.5 per plant for each of 1st, 2nd and 3rd instars and 14 per plant for 4th instars. Maximum density for newly emerged adults was 57 per plant in mid-July at the 2000 Lethbridge unprotected plot. Defoliation was very low at the beginning of the season but increased sharply when 3rd and 4th instar populations peaked and continued to rise as new adults emerged. Maximum defoliation occurred at the Lethbridge plot in 2000 with 100% defoliation by 10 August. Total yields in all unprotected plots ranged from 10 to 40% lower than in the protected plots. Mean density of overwintering adults within potato plots was 76 beetles m-2 with a maximum of 232 m-2. Mean overwintering mortality was 22% and mean depth of overwintering adults was 12 cm, with 63% of the beetles collected at depths ≤ 10 cm. Our results indicate that the phenology of the beetle is similar to that reported in areas where population buildups were rapid and devastating soon after insecticide resistant populations appeared. Consequently the beetle must be considered as a serious threat to potato production in southern Alberta.

The Colorado potato beetle in movement

2003 ◽  
Vol 135 (1) ◽  
pp. 1-22 ◽  
Author(s):  
G. Boiteau ◽  
A. Alyokhin ◽  
D.N. Ferro
Keyword(s):  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Recent Literature ◽  
Abiotic Factors ◽  
Orientation Process ◽  
Potato Beetle ◽  
Host Habitat ◽  
Subject Areas ◽  
Refuge Areas

AbstractThe recent introduction of the concept of refuge areas for the management of the Colorado potato beetle, Leptinotarsa decemlineata (Say) (Coleoptera : Chrysomelidae), on resistant potato highlighted the existence of important gaps in our knowledge and understanding of this pest's movement within and between habitats. The objective of this review is to synthesize the information available for the benefit of crop managers and to identify subject areas in need of additional research. A traditional, somewhat encyclopedic, review of the old and recent literature on research methods, basics of flight and walking, as well as abiotic and biotic conditions for dispersal, revealed a considerable volume of information accumulated since the early 1900s. There is a consensus on the role of abiotic factors on flight and walking, but a better understanding of the biotic factors will be required before the variability of the dispersal response can be fully explained or predicted. Cybernetic models of orientation proposed in the literature were pulled together into a schematic representation of the orientation process in walking L. decemlineata. The model begins the integration of the different conditions and underlying suggested mechanisms responsible for the orientation of the walking beetle. There is remarkably little information on the orientation of potato beetles during flight. Finally, the seasonality of walking and flight dispersal is reviewed in relation to the host habitat and overwintering sites.

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