This study evaluated the development and reproduction of Ceraeochrysa cubana when fed the citrus blackfly Aleurocanthus woglumi. The study was carried out at the Laboratory of Entomology, Department of Plant and Environmental Sciences, Federal University of Paraíba – Areia/PB. It used a completely randomized design. The study was conducted in climate chambers, regulated to 26 ± 2°C and a relative humidity of 70 ± 10% with a 12 h photoperiod. The treatments were as follows: eggs, nymphs of only the 1st, 2nd, 3rd, or 4th instars, and nymphs of multiple instars (1st, 2nd, 3rd, and 4th instars) of A. woglumi, with eggs of Sitotroga cerealella as a control. The 1st instar of C. cubana lasted 5.8 to 10.7 days, the 2nd instar lasted 6.0 to 13.3 days, and the 3rd instar lasted 8.2 to 18.5 days. The larvae of C. cubana did not survive when the food provided was only the eggs of A. woglumi, since the predator could not eat them. C. cubana, when provided nymphs of multiple instars (1st, 2nd, 3rd, and 4th instars) of the citrus blackfly, had a shorter pre-pupal period and lower longevity than when consuming the eggs of S. cerealella, but the sex ratio and oviposition period were not affected. However, changes occurred in the pre-oviposition period, the total number of eggs, and the number of viable eggs.
Fruit flies are considered an important fruit pest for world fruit production because they cause significant losses to the production and limit fruit free transport due to quarantine restrictions imposed by importing countries. Fruit flies population dynamics knowledge of a particular region is an important factor in the management of this pest. Traps are devices created to attract and capture flies by sexual attraction or food attraction, both put inside the trap. It reduces fruit flies population in the orchard, decreasing the pressure and chances of an infestation. This research aimed to evaluate the efficiency of food baits in the fruit flies capture on guava plant culture, in order to establish an adequate program for this pest in the municipality of Nova Floresta – PB. Monitoring of the adult fruit-fly was performed with aid of plastic traps of the type PET bottle 330 mL of Bio Anastrepha® 5.0%, 440 mL of sugarcane molasses diluted to 10.0% and 520 mL of 30.0% fruit juice (guava). The traps were installed in the central part of the trees, approximately 1.50 m above ground. Every 15 days adult fruit flies were caught, the occasion that food baits were replaced. From these data were evaluated: efficiency of food baits, MAD index (flies/trap/day) and food baits cost-benefit analysis. The best food attractant at the lowest cost was Bio Anastrepha® at 5.0%, with a catch margin of 63.83%, followed by fruit juice at 30.0% and sugarcane molasses at 10.0%, with 34.04% and 2.13%, respectively.
Knowledge of the population fluctuation of a pest in an orchard allows the producer preventing and making use of techniques that control the insect pest before it causes economic damages. The objective of the present work was to verify fruit fly species population dynamics in a commercial of Psidium guajava L. (Myrtaceae) orchard in the Curimataú microregion of Paraíba, also to characterize the community of fruit flies through faunistic analysis as well. Fruits were collected biweekly, the total was 24 collections between August 2014 and July 2015 in the municipality of Nova Floresta-PB. Fruits were preferentially collected mature or at the beginning of maturation, differentiating fruits harvested on the soil, plants, and through PET traps containing different food attractants. After collection, fruits were kept in plastic trays filled with a layer of two centimeters of sterilized sand and covered with fabric ‘voil’. The trays were labeled with the field data and placed in a greenhouse. Past the period of 15-25 days the fruits, already in the stage of decomposition were examined in order to collect pupae and larvae of 3rd instar. A total of 462 specimens of fruit flies were collected in 12 months sampling period, they were collected from fruits gathered from the ground and from the tree, and through trapping, being 209 males and 253 females, all collected in P. guajava. From the results obtained during the sampling period, a total of four species were recorded by fruit collection and six species by a trap. A new specimen of Anastrepha was found that there was no register in Paraíba yet, Anastrepha hadropickeli Canal, Uramoto and Zucchi (2013), as well as a Rhagoletis sp. (Loew).
Introduction. Citrus trees in Brazil are often attacked by the blackfly, Aleurocanthus woglumi Ashby. The induction of resistance to control this pest is required to maintain the sanitary and nutritional quality of the crop. The aim of this study was to evaluate the potential of silicon in the form of potassium silicate (K 2 SiO 3 ) to modify the activity of enzymes involved in the defence of Citrus reticulata and to find any correlation between the activity of these enzymes and the development of A. woglumi. Materials and methods. The study was conducted in a greenhouse using seedlings of C. reticulate cv. 'Dancy' in the following one-application treatments: T 1 : Infestation with A. woglumi and no K 2 SiO 3 (control, "C"); T 2 : No A. woglumi and no K 2 SiO 3 (absolute control "AC"); T 3 : 17 g L −1 K 2 SiO + A. woglumi, T 4 : 35 g L −1 K 2 SiO + A. woglumi; T 5 : 52 g L −1 K 2 SiO + A. woglumi; and T 6 : 70 g L −1 K 2 SiO + A. woglumi. To perform the enzymatic analyses, one leaf was removed separately from each mandarin seedling after 10, 30, 50, 70, and 90 days of continuous feeding of A. woglumi. The activity of peroxidase, polyphenol oxidase and phenylalanine ammonia-lyase was assessed. Results and discussion. The correlation between peroxidase activity and A. woglumi development was positive. The peroxidase and polyphenol activities indicated strong induction of plant defences against A. woglumi. The increase in peroxidase and polyphenoloxidase activity revealed the induction of synthesis of compounds for plant defence against A. woglumi, but this effect depended on the time of A. woglumi feeding and on the concentration of silicon. Conclusion. Silicon was shown to be an elicitor that potentiates the defence mechanisms of C. reticulata to A. woglumi.Keywords: Brazil / mandarin (Citrus reticulate) / blackfly (Aleurocanthus woglumi) / resistance inductor / peroxidase / polyphenol oxidase / phenylalanine ammonia-lyase Résumé -Résistance aux aleurodes noires des agrumes induite par le silicate de potassium dans les semis de mandarinier (Citrus reticulata). Introduction. Les agrumes au Brésil sont fréquemment attaqués par des aleurodes (Aleurocanthus woglumi Ashby). L'induction de résistance pour lutter contre ce ravageur est nécessaire pour maintenir la qualité sanitaire et nutritionnelle de la récolte. Le but de cette étude était d'évaluer le potentiel du silicium sous la forme de silicate de potassium (K 2 SiO 3 ) dans la modification de l'activité des enzymes impliquées dans la réaction de défense du mandarinier (Citrus reticulata), et aussi de trouver une corrélation entre l'activité de ces enzymes et le développement des aleurodes. Matériel et méthodes. L'étude a été menée en serre en utilisant des plants de mandarinier cv. Dancy. Les traitements suivants ont été appliqués : T 1
Resumo. Objetivou-se avaliar o desenvolvimento biológico das fases imaturas de Ceraeochrysa cubana Hagen alimentada com ovos de Ephestia kueniella Zeller submetida a diferentes dietas com ingredientes em diferentes concentrações (%): Farinha de milho (50%) + Farinha de trigo (50%) + Lêvedo de cerveja (3%); Farinha de milho transgênico (fubá) (50%) + Farinha de Trigo (50%) + Lêvedo de cerveja (3%); Farinha de rosca (97%) + Lêvedo de cerveja (3%); Farinha de rosca (48,5%) + Farinha de trigo (48,5%) + Lêvedo de cerveja (3%); Farinha de arroz (97%) + Lêvedo de cerveja (3%); Farinha de arroz (48,5%) + Farinha de trigo (48,5%) + Lêvedo de cerveja (3%); Farinha de aveia (97%) + Lêvedo de cerveja (3%); Farinha de aveia (48,5%) + Farinha de trigo (48,5%) + Lêvedo de cerveja (3%). Avaliaram-se os períodos de cada estádio larval, larval completo, pré-pupa+pupa, larva-adulto, razão sexual, viabilidades larval e pupal. Dietas com farinha de aveia para a traçapromovem maior tempo para o predador alcançar a fase adulta, com farinha de arroz baixa razão sexual e com farinha de rosca baixa viabilidade pupal. Dietas contendo farinha de milho são as mais recomendadas para E. kuehniella, visando à criação de C. cubana.Influence of feeding of Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) on development of Ceraeochrysa cubana Hagen (Neuroptera: Chrysopidae)Abstract. Aimed to evaluate the biological development of Ceraeochrysa cubana Hagen immature stages fed on eggs of the mothsubmitted to different food substrates with ingredients on different concentrations (%): Corn flour (50%) + Wheat flour (50%) + Brewer’s yeast (3%); Transgenic corn flour (50%) + Wheat flour (50%) + Brewer’s yeast (3%); Breadcrumbs (97%) + Brewer’s yeast (3%); Breadcrumbs (48.5%) + Wheat flour (48.5%) + Brewer’s yeast (3%); Rice flour (97%) + Brewer’s yeast (3%); Rice flour (48.5%) + Wheat flour (48.5 %) + Brewer’s yeast (3%); Oatmeal (97%) + Brewer’s yeast (3%); Oatmeal (48.5%) + Wheat flour (48.5%) + Brewer’s yeast (3%). We evaluated the period of each larval stage, complete larval period, pre pupal+pupal period, and larva to adulthood period, larval and pupal feasibility. Diets with oatmeal provided for moth promote greater time for the predator reach adulthood, with rice flour low sex ratio and with breadcrumbs low pupal feasibility. Diets formulated with corn flours + brewer’s yeast are most recommended for Ephestia kuehniella Zeller, aiming C. cubana mass rearing.
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