The Apple Cipra Network in Canada: Using Real-Time Weather Information to Forecast Apple Phenology, Insects, Diseases and Physiological Disorders

Bacillus thuringiensis (B. t.) based formulations have been widely used to control lepidopteran pests in agriculture and forestry. One of their weaknesses is their short residual activity when sprayed in the field. Using Pickering emulsions, mixtures of spores and crystals from three B. t. serovars were successfully encapsulated in colloïdosomal microparticles (50 μm) using innocuous chemicals (acrylic particles, sunflower oil, iron oxide nanoparticles, ethanol and water). A pH trigger mechanism was incorporated within the particles so that B. t. release occurred only at pH > 8.5 which corresponds to the midgut pH of the target pests. Laboratory assays performed on Trichoplusia ni (T. ni) larvae demonstrated that the microencapsulation process did not impair B. t. bioactivity. The best formulations were field-tested on three key lepidopteran pests that attack Brassica crops, i.e., the imported cabbageworm, the cabbage looper and the diamondback moth. After 12 days, the mean number of larvae was significantly lower in microencapsulated formulations than in a commercial B. t. formulation, and the effect of microencapsulated formulations was comparable to a chemical pesticide (lambda-cyhalothrin). Therefore, colloïdosomal microcapsule formulations successfully extend the bioactivity of B. t. for the management of lepidopteran pests of Brassica crops.

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“…600 m from the efficacy trial. Relevant data was extracted form a database with the software CIPRA ( Bourgeois et al, 2008 ).…”

Section: Methodsmentioning

confidence: 99%

Controlled-release ofBacillus thurigiensisformulations encapsulated in light-resistant colloidosomal microcapsules for the management of lepidopteran pests ofBrassicacrops

Bashir

Claverie

Lemoyne

et al. 2016

PeerJ

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“…Weather data were obtained from the National Land and Water Information Service (Agriculture and Agri-Food Canada, 2007) and the weather apple network in Quebec (Bourgeois et al, 2008). Weather parameters available for analyses include: minimum, maximum, and mean daily air temperatures (°C) and daily precipitation (mm).…”

Section: Methodsmentioning

confidence: 99%

Effects of Preharvest Weather Conditions on Firmness of ‘McIntosh’ Apples at Harvest Time

Lachapelle¹,

Bourgeois²,

DeEll³

2013

horts

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Apple fruit firmness is one of the main attributes indicating fruit quality at harvest. It is affected by numerous factors during the entire growing season. The effects of weather conditions during apple development are often mentioned as a result of their impact on attributes linked to fruit firmness: fruit size, calcium concentration, water content, etc. In this study, the effects of weather conditions on ‘McIntosh’ apple (Malus ×domestica Borkh. cv. McIntosh) firmness at harvest time were analyzed. Fruit were harvested at nine sites in Quebec and Ontario over 15 years (1996–2011). For each case, weather parameters were analyzed from full bloom until harvest, either in monthly subperiods from May until September or in terms of days from full bloom (DFB) until harvest. Regression results highlighted the negative effect of lower air temperature conditions from 31 to 60 DFB, higher air temperature conditions and precipitations from 61 to 90 DFB, and higher temperature conditions from 91 DFB until harvest on ‘McIntosh’ apple firmness level at harvest. Precipitation from 61 to 90 DFB alone explained 39% of ‘McIntosh’ apple firmness variation at harvest time. The prediction of apple firmness at harvest time could be helpful for producers to adjust their marketing and storage strategies according to apple quality level.

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“…600 m from the efficacy trial. Relevant data was extracted form a database with the software CIPRA [28].…”

Section: Insect Rearing Laboratory Assays Field Trial and Persistenmentioning

confidence: 99%

Peer Review #1 of "Controlled-release of Bacillus thurigiensis formulations encapsulated in light-resistant colloidosomal microcapsules for the management of lepidopteran pests of Brassica crops (v0.1)"

2016

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Bacillus thuringiensis (B. t.) based formulations have been widely used to control lepidopteran pests in agriculture and forestry. One of their weaknesses is their short residual activity when sprayed in the field. Using Pickering emulsions, mixtures of spores and crystals from three B. t. serovars were successfully encapsulated in colloïdosomal microparticles (50 μm) using innocuous chemicals (acrylic particles, sunflower oil, iron oxide nanoparticles, ethanol and water). A pH trigger mechanism was incorporated within the particles so that B. t. release occurred only at pH > 8.5 which corresponds to the midgut pH of the target pests. Laboratory assays performed on Trichoplusia ni larvae demonstrated that the microencapsulation process did not impair B. t bioactivity. The best formulations were field-tested on three key lepidopteran pests that attack Brassica crops, i.e., the imported cabbageworm, the cabbage looper and the diamondback moth. After 12 days, the mean number of larvae was significantly lower in microencapsulated formulations than in a commercial B. t. formulation, and the effect of microencapsulated formulations was comparable to a chemical pesticide (lambda-cyhalothrin). Therefore, colloïdosomal microcapsule formulations successfully extend the bioactivity of B. t. for the management of lepidopteran pests of Brassica crops.

show abstract

The Apple Cipra Network in Canada: Using Real-Time Weather Information to Forecast Apple Phenology, Insects, Diseases and Physiological Disorders

Cited by 10 publications

References 0 publications

Controlled-release ofBacillus thurigiensisformulations encapsulated in light-resistant colloidosomal microcapsules for the management of lepidopteran pests ofBrassicacrops

Controlled-release ofBacillus thurigiensisformulations encapsulated in light-resistant colloidosomal microcapsules for the management of lepidopteran pests ofBrassicacrops

Effects of Preharvest Weather Conditions on Firmness of ‘McIntosh’ Apples at Harvest Time

Peer Review #1 of "Controlled-release of Bacillus thurigiensis formulations encapsulated in light-resistant colloidosomal microcapsules for the management of lepidopteran pests of Brassica crops (v0.1)"

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