EFFECTS OF PHOTOPERIOD AND PREY TYPE ON DIAPAUSE TENDENCY AND PREOVIPOSITION PERIOD IN PERILLUS BIOCULATUS (HEMIPTERA: PENTATOMIDAE)

1998 ◽  
Vol 130 (3) ◽  
pp. 315-320 ◽  
Author(s):  
David R. Horton ◽  
Tonya Hinojosa ◽  
Stacie R. Olson
Keyword(s):  
Colorado Potato Beetle ◽  
Life Stage ◽  
Prey Type ◽  
Probit Analysis ◽  
Day Length ◽  
Preoviposition Period ◽  
Potato Beetle ◽  
Perillus Bioculatus ◽  
Reproductive Activities ◽  
Number Of Individuals

AbstractAttempts at using Perillus bioculatus (F.) for control of Colorado potato beetle, Leptinotarsa decemlineata (Say), have been hampered by an incomplete understanding of the predator’s over-wintering biology. This study determined the effects of photoperiod and life stage of prey (Colorado potato beetle) on tendency for adult females to enter reproductive diapause, duration of the preoviposition period, and mortality of females. Perillus bioculatus showed an increasing tendency to enter diapause rather than to initiate reproductive activities as day length decreased. Females that were fed large beetle larvae (mid to late fourth instar) showed a significant increase in the number of individuals entering diapause compared with females that were fed a mix of beetle eggs and small larvae (first to third instar). Probit analysis was used to estimate the photoperiod that caused 50% of females to enter diapause; these estimates were 15L:9D for females feeding on large larvae, and 14.5L:9.5D for females feeding on eggs and small larvae. Females that were fed large larvae also showed a longer preoviposition period and had a slightly significant higher rate of mortality than those fed eggs and small larvae.

GROUND AND AERIAL MOVEMENT OF ADULT COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE) IN A UNIVOLTINE POPULATION

1999 ◽  
Vol 131 (4) ◽  
pp. 521-538 ◽  
Author(s):  
Christine Noronha ◽  
Conrad Cloutier
Keyword(s):  
Solanum Tuberosum ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Low Frequency ◽  
The Sun ◽  
Inundative Release ◽  
Potato Beetle ◽  
Perillus Bioculatus ◽  
Movement Frequency

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.

scholarly journals Field Evaluation of Natural, Engineered, and Combined Resistance Mechanisms in Potato for Control of Colorado Potato Beetle

2003 ◽  
Vol 128 (2) ◽  
pp. 219-224 ◽  
Author(s):  
Joseph J. Coombs ◽  
David S Douches ◽  
Wenbin Li ◽  
Edward J. Grafius ◽  
Walter L. Pett
Keyword(s):  
Host Plant ◽  
Plant Resistance ◽  
Colorado Potato Beetle ◽  
Host Plant Resistance ◽  
Glandular Trichomes ◽  
Glandular Trichome ◽  
Resistance Mechanisms ◽  
Potato Beetle ◽  
Transgenic Lines ◽  
Number Of Individuals

The colorado potato beetle, Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae), is the leading insect pest of potato (Solanum tuberosum L.) in northern latitudes. Host plant resistance has the potential use in an integrated pest management program for control of colorado potato beetle. During the 1998 and 1999 seasons, field studies were conducted to compare natural (leptine glycoalkaloids and glandular trichomes), engineered (Bt-cry3A and Bt-cry5 transgenic potato lines), and combined (Bt-cry5+glandular trichomes) plant resistance mechanisms of potato for control of colorado potato beetle. Nine different potato clones representing five different host plant resistance mechanisms were evaluated under natural colorado potato beetle infestation at the Montcalm Research Farm in Entrican, Michigan. The Bt-cry3A transgenic lines, the high leptine line (USDA8380-1), and the high foliar glycoalkaloid line (ND5873-15) were most effective for controlling defoliation by colorado potato beetle adults and larvae. The Bt-cry5 line (SPc5-G2) was not as effective as the Bt-cry3A transgenic lines ('Russet Burbank Newleaf,' RBN15, and YGc3.1). The glandular trichome (NYL235-4) and Bt-cry5+glandular trichome lines proved to be ineffective. Significant rank correlations for the potato lines between the two years were observed for egg masses, second and third instar, and fourth instar seasonal cumulative mean number of individuals per plant, and defoliation. Egg mass and first instar seasonal cumulative mean number of individuals per plant were not strong indicators of host plant resistance in contrast to second and third instars or adults. Based on these results, the Bt-cry3A transgenic lines, the high leptine line, and the high total glycoalkaloid line are effective host plant resistance mechanisms for control of colorado potato beetle.

BIOLOGICAL CONTROL OF THE COLORADO POTATO BEETLE LEPTINOTARSA DECEMLINEATA (COLEOPTERA: CHRYSOMELIDAE) IN QUEBEC BY AUGMENTATIVE RELEASES OF THE TWO-SPOTTED STINKBUG PERILLUS BIOCULATUS (HEMIPTERA: PENTATOMIDAE)

1995 ◽  
Vol 127 (2) ◽  
pp. 195-212 ◽  
Author(s):  
Conrad Cloutier ◽  
France Bauduin
Keyword(s):  
Biological Control ◽  
Colorado Potato Beetle ◽  
First Generation ◽  
Release Time ◽  
Egg Mass ◽  
Predator Density ◽  
Predator Prey ◽  
Potato Beetle ◽  
Perillus Bioculatus ◽  
Augmentative Releases

AbstractField plot tests during two seasons show that augmentative releases of Perillus bioculatus can control first-generation eggs and larvae of the Colorado potato beetle (CPB) under Quebec short-season conditions. Stinkbugs mass-reared on CPB were introduced manually as 2nd- and 3rd-stage nymphs during spring oviposition of the beetle at densities of one nymph per 50–225 CPB eggs recruited per plant, in 0.025-ha plots. Sampling at intervals of 1–3 days measured predator establishment, CPB egg and larval mortality, and foliage protection level. Direct observations were used to document predator-prey relationships and to determine weather conditions favourable to P. bioculatus.In the 1 st-year test, with predators released over all plants within plots, CPB control was compared among: (1) stinkbugs alone, (2) the bioinsecticide Bacillus thuringiensis (BT) as Trident™, (3) a combination of both control alternatives, and (4) no protection against the CPB. BT and stinkbugs, both alone and in combination, produced significant control as measured by percentage reductions in prepupal drop to the ground, new adult emergence, and foliage protection. Only treatments involving P. bioculatus reduced CPB egg eclosion which was the key control factor; it is strongly correlated with overall control level.In the 2nd-year test, predators were released in a central area comprising only 25% of all plants within plots. Predator and CPB egg mass densities were manipulated to produce predator: prey ratios of 0:1, 0:2, 1.5:2, 1.5:1, 3:2, and 3:1, representing average ratios of 0, 1.5,or 3 P. bioculatus per plant, and 1 or 2 CPB egg masses per plant at release time. As expected, central release produced complex interactions between control, and predator and prey densities. High beetle density slowed predator emigration from the centre, more so at low predator density than at high predator density. Predators moved more quickly within the same row than across rows. CPB eggs were destroyed in large numbers in both years but in 1993, final control correlated with larval rather than egg predation. A maximum 80% reduction in prepupal drop to the ground was obtained at the 3:1 predator:prey ratio (1 P. bioculatus:95 CPB eggs recruited per plant).The results prove the efficacy of P. bioculatus for biological control of first-generation L. decemlineata populations, at densities resulting in approximately 300 eggs laid per plant during spring oviposition in the study area. Despite low natural populations of P. bioculatus and unclear prospects for commercial availability at reasonable cost, it is evident that stinkbug releases have potential as a non-chemical control measure within an IPM program in Quebec potato production.

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

1996 ◽  
Vol 31 (2) ◽  
pp. 191-198 ◽  
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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