Evaluating Edovum puttleri Grissell and Podisus maculiventris (Say) for Augmentative Biological Control of Colorado Potato Beetle in Tomatoes

1999 ◽  
Vol 16 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Philip W Tipping ◽  
Carol A Holko ◽  
Aref A Abdul-Baki ◽  
Jeffrey R Aldrich
Keyword(s):  
Biological Control ◽  
Colorado Potato Beetle ◽  
Podisus Maculiventris ◽  
Edovum Puttleri ◽  
Augmentative Biological Control ◽  
Potato Beetle

Alightment of Edovum puttleri Grissell (Hymenoptera: Eulophidae) in Response to Colors Mimicking Three Hosts of the Colorado Potato Beetle (Coleoptera: Chrysomelidae)

1997 ◽  
Vol 32 (4) ◽  
pp. 386-397 ◽  
Author(s):  
Barbra Vasquez ◽  
James H. Lashomb ◽  
George Hamilton
Keyword(s):  
Colorado Potato Beetle ◽  
Paired Comparisons ◽  
Leaf Color ◽  
Edovum Puttleri ◽  
Potato Beetle ◽  
Board Test

The effect of leaf color on alighting behavior of Edovum puttleri Grissell was examined in a laboratory sticky-board test. Paint models mimicking the leaf top colors of eggplant, potato, and tomato and a model mimicking average underside leaf color were tested in paired comparisons. The underside leaf color mimic was the most preferred; no significant differences in landing rates occurred among any of the three leaf top color mimics. The underside leaf color mimic also was tested against two gray shades sharing the same intensity of reflectance; no significant differences were detected. The parasitoid, therefore, preferentially alighted based on the intensity and not the hue of the models. For all assays, a significant departure from randomness was found because a higher percentage of females alighted on the paint models than that which was in the colony. This suggests that parasitoids were alighting in a search for host eggs.

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.

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