Efficacy of<i>Beauveria bassiana</i>applications on coffee berry borer across an elevation gradient in Hawaii

Greco, Elsie B.; Wright, Mark G.; Burgueño, Juan; Jaronski, Stefan T.

doi:10.1080/09583157.2018.1493088

Cited by 25 publications

(19 citation statements)

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“…Studies aimed at improving control measures are particularly important for regions that experience high labor and production costs, such as Hawaii and Puerto Rico. For example, biopesticides like the entomopathogenic fungus Beauveria bassiana are commerically available to control CBB in Hawaii [15] and Puerto Rico [16], but the frequency, dosage, and timing of sprays is usually arbitrary [17]. To optimize results and improve the cost-effectiveness of these biopesticides, sprays must be accurately timed with the emergence of adult CBB females seeking new berries to infest, because this is when they are exposed and most vulnerable [17].…”

Section: Introductionmentioning

confidence: 99%

Coffee berry borer (Hypothenemus hampei) (Coleoptera: Curculionidae) development across an elevational gradient on Hawai‘i Island: Applying laboratory degree-day predictions to natural field populations

et al. 2019

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Coffee berry borer (CBB, Hypothenemus hampei ) (Coleoptera: Curculionidae: Scolytinae) is the most destructive pest of coffee worldwide. Information on CBB development times can be used to predict the initiation of new infestation cycles early in the coffee-growing season and thus inform the timing of insecticide applications. While laboratory estimates of CBB development under constant conditions exist, they have not been applied under the heterogeneous environmental conditions that characterize many coffee-growing regions. We measured CBB development times and abundance in commercial coffee farms across an elevational gradient on Hawai‘i Island and applied thermal accumulation models from previous laboratory studies to test their fit to field data. Artificial lures were used to infest coffee berries at five farms ranging in elevation from 279–792 m, and weather variables were monitored at macro (farm-level) and micro (branch-level) scales. CBB development was followed in the field from the time of initial berry infestation by the founding female through the development of F1 mature adults. Mean development time from egg to adult across all sites was 38.5 ± 3.46 days, while the mean time required for the completion of a full life cycle (from time of infestation to presence of mature F1 females) was 50.9 ± 3.35 days. Development time increased with increasing elevation and decreasing temperature. Using macro-scale temperature data and two different estimates for the lower temperature threshold (14.9°C and 13.9°C), we estimated a mean requirement of 332 ± 14 degree-days and 386 ± 16 degree-days, respectively, from the time of berry infestation to the initiation of a new reproductive cycle in mature coffee berries. Similar estimates were obtained using micro-scale temperature data, indicating that macro-scale temperature monitoring is sufficient for life-cycle prediction. We also present a model relating elevation to number of CBB generations per month. Our findings suggest that CBB development times from laboratory studies are generally applicable to field conditions on Hawai‘i Island and can be used as a decision support tool to improve IPM strategies for this worldwide pest of coffee.

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Section: Introductionmentioning

confidence: 99%

Coffee berry borer (Hypothenemus hampei) (Coleoptera: Curculionidae) development across an elevational gradient on Hawai‘i Island: Applying laboratory degree-day predictions to natural field populations

et al. 2019

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“…Studies investigating additional control tactics, such as the release of CBB-predatory beetles (Follett et al, 2016) and the introduction of specific parasitoids (Follett, 2018), are ongoing. Among the few available insecticides in Hawaii, B. bassiana is compatible with environmental and worker safety concerns (Kawabata et al, 2017;Greco et al, 2018). Since many growers use calendar sprays (LFA observations), we assessed the effectiveness and cost of sprays based on field monitoring data.…”

Section: Discussionmentioning

confidence: 99%

“…For example, sporulation and secondary transmission of the fungus may depend on environmental variables (Mascarin and Jaronski, 2016). Greco et al (2018) reported that B. bassiana infections were favored by higherelevation locations in the Kona district, Hawaii. In Colombia, infection rates between 20 and 75% reflect variability in spray coverage, environmental conditions, and field label dosages (Bustillo et al, 1998(Bustillo et al, , 1999.…”

Section: Discussionmentioning

confidence: 99%

“…In Hawaii, natural infection of endemic B. bassiana strains has been noted (Wraight et al, 2018). Insecticides based on the commercial GHA strain of B. bassiana have recently been registered and imported for use in the Islands (Greco et al, 2018). Currently, the use of B. bassiana is recommended to coffee growers in Hawaii within IPM programs for the CBB (Kawabata et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Incorporating Beauveria bassiana Into an Integrated Pest Management Plan for Coffee Berry Borer in Hawaii

Hollingsworth

Aristizábal

Shriner

et al. 2020

Front. Sustain. Food Syst.

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Since its recent establishment in Hawaii, the coffee berry borer (CBB), Hypothenemus hampei (Coleoptera: Curculionidae), threatens yields, quality, and price of coffee production. A limited number of insecticides (primarily Beauveria bassiana) are used to control CBB with minimal disruption in this agroecosystem. We evaluated two insecticide spray strategies across eight coffee farms in the Kona and Ka'u districts of Hawaii Island. Coffee growers sprayed insecticides approximately monthly (calendar basis) or else in response to CBB field monitoring data (threshold based). Overall, farms adopting spray thresholds performed more insecticide applications early in the season (May to July), but significantly fewer overall, when compared with calendar-based strategies (i.e., 4-5 vs. 7-11 seasonal sprays, respectively). Generalized linear models assessing the variability in CBB infestation rates, berry penetration, and infection by B. bassiana indicated that threshold-based sprays provided equivalent CBB control compared with calendar ones. When corrected for yield, there were economic savings for threshold-vs. calendar-based spray programs (i.e., cost 5.4 vs. 11.8% of gross yield). Total defects in processed coffee after harvest were statistically similar between the two spray regimes, i.e., 8.5 ± 1.0% and 10.4 ± 1.7%, respectively. We hypothesize that B. bassiana applied early in the season is more effective, since the fungus targets initial CBB infestations when the prolonged location of founder females in the outer berry endosperm favors its infection. Our study suggests that spray timing for CBB based on field monitoring data can reduce costs; however, additional measures, such as field and post-harvest sanitation, are necessary to achieve sustainable CBB control in the Islands.

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“…The stem injection technique was only applied against R. ferrugineus larvae and pupae, which remain inside the plant [ 131 , 132 , 155 , 156 ], while the spray applications were invariably targeting adult weevils such as A. signatus [ 157 ], C. sordidus [ 97 , 158 ], Cylas spp. [ 159 ], H. hampei [ 109 , 160 , 161 , 162 , 163 ], P. juglandis [ 123 ], R. ferrugineus [ 125 , 164 , 165 ] and S. amygdali [ 144 ], which are exposed outside the plant as adults. Variable control was achieved according to the fungal species used [ 160 ], fungal persistence [ 155 , 157 ], application technique [ 125 ], frequency of the application [ 163 ], weather conditions [ 109 , 151 , 152 , 153 ] and insect species.…”

Section: Effect Of Fungal Entomopathogens On Weevils With Life Cycmentioning

confidence: 99%

Integration of Entomopathogenic Fungi into IPM Programs: Studies Involving Weevils (Coleoptera: Curculionoidea) Affecting Horticultural Crops

Khun

Wilson

Stevens

et al. 2020

Insects

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Weevils are significant pests of horticultural crops and are largely managed with insecticides. In response to concerns about negative impacts of synthetic insecticides on humans and the environment, entomopathogenic fungi (EPF) have been developed as an alternative method of control, and as such appear to be “ready-made” components of integrated pest management (IPM) programs. As the success of pest control requires a thorough knowledge of the biology of the pests, this review summarises our current knowledge of weevil biology on nut trees, fruit crops, plant storage roots, and palm trees. In addition, three groups of life cycles are defined based on weevil developmental habitats, and together with information from studies of EPF activity on these groups, we discuss the tactics for integrating EPF into IPM programs. Finally, we highlight the gaps in the research required to optimise the performance of EPF and provide recommendations for the improvement of EPF efficacy for the management of key weevils of horticultural crops.

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Efficacy ofBeauveria bassianaapplications on coffee berry borer across an elevation gradient in Hawaii

Cited by 25 publications

References 25 publications

Coffee berry borer (Hypothenemus hampei) (Coleoptera: Curculionidae) development across an elevational gradient on Hawai‘i Island: Applying laboratory degree-day predictions to natural field populations

Coffee berry borer (Hypothenemus hampei) (Coleoptera: Curculionidae) development across an elevational gradient on Hawai‘i Island: Applying laboratory degree-day predictions to natural field populations

Incorporating Beauveria bassiana Into an Integrated Pest Management Plan for Coffee Berry Borer in Hawaii

Integration of Entomopathogenic Fungi into IPM Programs: Studies Involving Weevils (Coleoptera: Curculionoidea) Affecting Horticultural Crops

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