Kent Daane - Academia.edu (original) (raw)

Papers by Kent Daane

Crop Protection, 2021

Abstract The mealybug, Planococcus ficus (Signoret), is one of the more damaging vineyard pests a... more Abstract The mealybug, Planococcus ficus (Signoret), is one of the more damaging vineyard pests and an important vector of Grapevine leafroll-associated viruses. Pheromone-mediated mating disruption is a commercially available and environmentally sustainable control tool for P. ficus. Here we report on a three-year areawide study of P. ficus mating disruption in Napa County, California, where pheromone dispensers were deployed across large (53-66 ha) multi-owner sites that were paired with sites that did not receive pheromone. Male P. ficus captures in pheromone traps were correlated with mealybug numbers and crop damage, and were useful in identifying ‘hotspots’ to be targeted with insecticide applications for areawide control. Trap catches at mating disruption sites were far lower than untreated sites, although mealybugs were still present at mating disruption sites. Evidence indicated that mating disruption reduced P. ficus density and spread, particularly in areas with low initial mealybug densities. In the third year, areawide mating disruption was discontinued at the former mating disruption sites and, as evidence of its impact, P. ficus trap captures increased. These results suggest that mating disruption and well-timed, effective insecticide applications play complementary roles, and that monitoring the areawide distribution of pests is a critical component of programs for controlling P. ficus.

Journal of Economic Entomology, 2015

Biological Control, Nov 1, 2021

Abstract Pachycrepoideus vindemiae and Trichopria drosophilae are cosmopolitan pupal parasitoids ... more Abstract Pachycrepoideus vindemiae and Trichopria drosophilae are cosmopolitan pupal parasitoids of Drosophilidae that attack the invasive Drosophila suzukii. This study investigated one aspect of their plasticity – host acceptance and offspring fitness on 25 Drosophila species in a phylogenetic framework. Each parasitoid’s key biological and ecological traits were compared among the different host species. Results demonstrate that both parasitoid species successfully parasitized and developed from all tested host species. Although the parasitoids’ efficiency and offspring fitness varied among host species, effects on life-history characteristics or ecological traits appeared to be unrelated to the phylogenetic position of tested host species. Both parasitoids benefited from attacking larger hosts, with body size of emerging progeny positively correlated to host size and an increased fecundity (mature egg load) of female wasps. Achieving larger body size came at no significant costs in immature development time. Results show remarkable levels of plasticity in the parasitoids’ body growth and development. Body size plasticity in T. drosophilae and P. vindemiae could improve biological control by increasing variation in parasitoid body sizes. Large size may not be advantageous under all conditions, however, and the parasitoids’ ecoservice impacts will be influenced not only by their plasticity to hosts but by environmental limitations such as temperature tolerances, habitat location, and host searching behaviors.

European Journal of Plant Pathology, 2016

Journal of Pest Science, 2016

After its arrival in 2008, the Spotted Wing Drosophila (SWD), Drosophila suzukii, has emerged as ... more After its arrival in 2008, the Spotted Wing Drosophila (SWD), Drosophila suzukii, has emerged as a harmful invasive insect pest in North America and Europe. This highly polyphagous pest is a major threat to many economically important fruit crops and is also known to develop on a wide variety of natural host plants. In Asia, Europe and North America, different control measures are applied against SWD, such as chemical, biological, and cultural control. Current controls of SWD rely primarily on the application of insecticides, but cultural management tactics such as sanitation and the use of nets provide a good alternative in some crops. Biological control measures, such as conservation of existing natural enemies in invaded areas, introduction of specialized larval parasitoids from Asia for classical biological control and the use of indigenous parasitoids for augmentative control, are currently being investigated and may become an important management tool in the near future for an area-wide control of SWD.

Bulletin of Insectology, Dec 1, 2015

Agricultural and Forest Entomology, Nov 1, 2008

1 The egg‐prepupal parasitoid Fopius arisanus (Hymenoptera: Braconidae) was evaluated in quaranti... more 1 The egg‐prepupal parasitoid Fopius arisanus (Hymenoptera: Braconidae) was evaluated in quarantine facilities as a potential biological control agent for the olive fruit fly Bactrocera oleae (Diptera: Tephritidae) in California, U.S.A.2 Nontarget testing of two weed biological control agents confirmed that F. arisanus will not attack Tephritidae that feed in inflorescences or galls. It may, however, pose risks to native Tephritidae that feed in fruit.3 Females preferentially oviposited in eggs, although first‐instar B. oleae were also attacked. Low lifetime reproductive potential and high rates of direct mortality inflicted on host eggs indicate that rearing on B. oleae may prove difficult.4 In multiparasitized B. oleae, F. arisanus prevailed in competition against two species of larval–pupal parasitoids, Diachasmimorpha kraussii and Psyttalia concolor (both Hymenoptera: Braconidae).5 The broad host‐range of F. arisanus with respect to fruit‐feeding Tephritidae may preclude its introduction to California, as may its low fecundity and its intrinsic competitive superiority over larva l–pupal parasitoids, which include specialists on B. oleae that are currently being introduced to California. High rates of direct mortality, however, point to potential uses in augmentative biological control. Whether or not F. arisanus is released in California, its biology as a parasitoid of B. oleae has been little studied to date and the results herein may be applied in other regions worldwide where B. oleae is a problem.

Environmental Entomology, Oct 31, 2022

Journal of Economic Entomology, Oct 7, 2019

Journal of Economic Entomology, Sep 13, 2021

Environmental Entomology, 2022

California pistachios are threatened by several stink bug species (Hemiptera: Pentatomidae), incl... more California pistachios are threatened by several stink bug species (Hemiptera: Pentatomidae), including the native Thyanta pallidovirens (Stål) and Chlorochroa uhleri (Stål), as well as the invasive Nezara viridula (L.). In pistachio, control tactics often target specific life stages, which makes knowledge about life histories fundamental to successful IPM programs. For that purpose, life history parameters of these stink bug species were assessed. Nymphal development and survivorship at seven constant temperatures, upper and lower development thresholds, thermal constants, adult longevity and fecundity, and life table parameters were evaluated. No species completed development at 15°C or 35°C. For N. viridula, egg to adult development was fastest at 30°C, whereas for T. pallidovirens there was no significant difference between 27.5 and 30°C and C. uhleri development was similar between 25 and 30°C. Egg to adult survival was highest at 22.5°C and 27.5°C. The thermal requirements as d...

Biological Control, 2021

Abstract Understanding and predicting potential competitive outcomes is critical in the design of... more Abstract Understanding and predicting potential competitive outcomes is critical in the design of biological control programs when considering multiple agent introductions. Tephritid fruit flies (Diptera: Tephritidae) include some of the most destructive pests of fruit and vegetable crops worldwide. Parasitoid guilds of fruit-infesting tephritids are dominated by opiines (Hymenoptera: Braconidae: Opiinae) that have been the main agents used for biological control of pest tephritids. All opiine parasitoids are solitary koinobiont endoparasitoids that attack host eggs or larvae and emerge as adults from host puparia. Thus, a host initially attacked by an egg-larval parasitoid can be subsequently attacked by a larval parasitoid, providing an ideal system to test the Early-acting Competitive Superiority Hypothesis (i.e., the first species occupying a host or exploiting early host stages has an advantage over competitive species). We reviewed the literature on interspecific competition among opiine fruit fly parasitoids, which reveals strong evidence supporting the early-acting competitive superiority hypothesis by egg-larval over larval parasitoids, through physiological suppression mechanisms. Competitive outcomes among larval parasitoids, however, depend on early action as well as the morphological characteristics used in direct physical competition of their first instars (e.g., size of mandibles). We discuss the range of ecological mechanisms facilitating coexistence of interacting species and highlight the ecological consequences of interspecific competition as evidenced by historical competitive displacements of introduced opiine parasitoids for biocontrol of tephritids. Finally, we provide a framework for exploring the role of interspecific competition, among other factors, in selecting opiine parasitoids for biocontrol of invasive tephritids.

AND LAYPERSON SUMMARY OF PROJECT ACCOMPLISHMENTS Brown Marmorated Stink Bug (BMSB) was found in i... more AND LAYPERSON SUMMARY OF PROJECT ACCOMPLISHMENTS Brown Marmorated Stink Bug (BMSB) was found in increasing numbers in vineyards in Oregon from 2013-2016. In California, BMSB was found in areas closely bordering vineyards, but not in any vineyards to date. Temperatures above and below feeding thresholds (Low=6°C, High =26°C) result in cessation of feeding. Older life stages such as adults were found to result in a significant increase in feeding damage on winegrape berries. The feeding activity in relation to berry quality parameters is given for 2015. Increased feeding activity resulted in a significant increase in stylet sheaths per berry. There was a numerical reduction in berry weight and diameter with increasing feeding levels. The number of stylet sheaths in relation to degree days (DD) per day was used to create a feeding factor for BMSB. This feeding factor was significantly correlated with the number of stylet sheaths per berry. Feeding data collected during 2015 and 2016 in...