Evaluating damage in the perianth: a new diagrammatic scale to estimate population level of Aceria guerreronis Keifer (Acari: Eriophyidae) in coconut fruits

Sousa, André Silva Guimarães; Gondim, Manoel G. C.; Argolo, Poliane Sá; Oliveira, A. R.

doi:10.15446/acag.v66n1.53491

Cited by 3 publications

(8 citation statements)

References 17 publications

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“…The eight-class scale showed the best results for accuracy and precision: the b value ranged from 0.83 and 1.01, with an average of 0.95; and only 16% of the raters tended to make systematic errors, indicating a high accuracy. This result is in agreement with the values obtained in the validation of other scales developed for the evaluation of pests (Boito et al, 2013;Sousa et al, 2017;Crenna et al, 2021). In addition, the mean R 2 value was the highest for the eight-class scale, ranging from 0.70 to 0.96 and being above 0.80 for 83% of the assessments, a result that confers a high precision to the estimation of foliar damage.…”

Section: Resultssupporting

confidence: 90%

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Diagrammatic scale to quantify the damage caused by bean thrips to the peanut crop

Crenna

Oddino

Giordano

et al. 2023

Pesq. agropec. bras.

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The objective of this work was to develop and validate a diagrammatic logarithmic scale to evaluate the damage caused by the Caliothrips phaseoli bean thrips to peanut (Arachis hypogaea). Leaflets of artificially infected peanut plants were collected, and the damaged leaf area (DLA) was calculated using the SisCob software. Six-, seven-, eight-, and nine-class scales were developed, and the range of each class was obtained with the 2-LOG software. The leaflets were analyzed by 12 raters using the four proposed scales. The scales were validated as to: precision and accuracy, using the linear regression between the DLA and estimated area; and reproducibility, by the linear regression between the estimations of the raters combined in pairs. The eight-class scale shows the best results in terms of accuracy and precision, as well as a high reproducibility.

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Section: Resultssupporting

confidence: 90%

“…In addition, the mean R 2 value was the highest for the eight-class scale, ranging from 0.70 to 0.96 and being above 0.80 for 83% of the assessments, a result that confers a high precision to the estimation of foliar damage. Values above 80% are considered excellent in scales considered of high precision (Capucho et al, 2011;Sousa et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Diagrammatic scale to quantify the damage caused by bean thrips to the peanut crop

Crenna

Oddino

Giordano

et al. 2023

Pesq. agropec. bras.

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“…(2022) suggested a new statistical model estimate populations of tarsonemids, which is based on the scale of notes proposed by Sousa et al . (2017) to estimate the population of A. guerreronis .…”

Section: Resultsmentioning

confidence: 99%

“…Due to the similarity in damage, many producers tend to attribute damage only to A. guerreronis (Navia et al 2005;França-Beltrão et al 2018. According to França-Beltrão et al (2022), negative phototropism, small size, and large populations make it difficult to estimate the mites that occur in the perianth of coconut fruits, suggesting a new statistical model to estimate the populations of tarsonemids in fruit coconuts, which is based on the rating scale proposed by Sousa et al (2017) to estimate the population of A. guerreronis.…”

Section: Faunistic Indicesmentioning

confidence: 99%

“…. To compensate for this,França- Beltrão et al (2022) suggested a new statistical model estimate populations of tarsonemids, which is based on the scale of notes proposed bySousa et al (2017) to estimate the population of A. guerreronis. Number of coconut fruits from bunches 13 to 17 with the presence of Aceria guerreronis and Steneotarsonemus furcatus in a coconut crop, from October 2019 to September 2020, at Pará state, Amazon, Brazil.…”

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confidence: 99%

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Acarofauna associated with coconut fruits (Cocos nucifera L.) in a crop area from Pará state, Amazon, Brazil

Alfaia

Duarte

Neto

et al. 2023

saa

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Aceria guerreronis Keifer and Steneotarsonemus furcatus De Leon are phytophagous mites that attack coconut fruits. These mites establish their colonies under the bracts in the perianth where they feed, causing necrosis and a loss of fruit quality and commercial value. Phytoseiidae is considered the most important family for the control of pest mites. With 256 species documented, the Phytoseiid fauna in Brazil is highly diversified. They are distributed across all Brazilian biomes, including the Amazon, Caatinga, Cerrado, Pampa, Atlantic Forest, and Pantanal. Regardless of the fact that the Amazon biome occupies an estimated 49% of the Brazilian territory, its acarofauna remains unexplored. In this region, coconut is one of the most cultivated crops, although the variety of mites in this crop in the Amazon is yet unclear. This information is essential since there are potential predatory species that can play an important role in the biological control of coconut pests. Thus, the present study investigated the diversity and seasonality of mites in coconut fruits in the Eastern Amazon production region throughout the year. Data were collected monthly and analyzed to determine the diversity and seasonality. The faunistic indices were calculated using the program ANAFAU, and the abundance and diversity of phytoseiids were analyzed using the software EstimateS. As the fruit ages, the quantity of injured fruits increases. The mites collected belonged to the families: Oribatida (20), Rhodacaroidea (14), Eriophyidae (473,904), Phytoseiidae (147), Tarsonemidae (133), Ascidae (122), Bdellidae (110), Tydeidae (59), Cunaxidae (7), Eupodidae (7), Cheyletidae (5), Blattisociidae (4), and Cryptognathidae (1). Throughout the collection period, A. guerreronis and S. furcatus were detected on fruits with and without damage, with A. guerreronis being the most prevalent. Predatory mites of the Phytoseiidae family were sampled from 12 collections, totaling 147 specimens distributed across eight species. Amblyseius aerialis (Muma) was the predominant predator species. The peak population of A. guerreronis and S. furcatus occurred in different periods, although both species were sampled during periods of high precipitation, suggesting adaptation to the climatic conditions of the region. Temperature was strongly correlated with mites of the Phytoseiidae family. The occurrence of these mites was more common in months with higher temperatures. The mite A. aerialis was discovered in 12 evaluations, with a greater occurrence in October 2019 and August 2020. Understanding the diversity, abundance, and population fluctuations of pest mites and their natural enemies in coconut plants is critical for developing integrated pest management strategies.

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Population dynamics of Aceria guerreronis and its natural enemies in coconut tree with and without application of pesticides

Ferreira

Noronha

Batista

2023

saa

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The coconut mite Aceria guerreronis Keifer is considered one of the most important pests of the coconut tree (Cocos nucifera L.), causing fruit malformation due to the appearance of cracks on the surface of the perianth below the bracts. This damage compromises fruit growth, reducing the production of solid and liquid albumen. The continuous use of chemical pesticides increases pest control costs, as in addition to being a practice highly harmful to the environment, it can also cause selection of resistant populations, as well as eliminate beneficial species. Therefore, the objective was to evaluate the population dynamics of A. guerreronis and its natural enemies, through the quantification of the most frequent and abundant predator species in two commercial areas of coconut plantation of the cultivar PB-121 (cross between Malaysian Yellow Dwarf x West African Giant). The study was conducted in Area 1 (with pesticide application), and Area 2 (without pesticide application - control) monthly from August 2018 to July 2019. Leaflets were collected (basal, median and apical part) from leaf 14 and fruits (bunches 4, 5, 6 and 7–4 to 6 months after inflorescence fertilization). In both areas, 933.580 mites were collected, 426,245 in Area 1 and 507.335 in Area 2, with emphasis on A. guerreronis (931.706 specimens – estimated value). Eriophid mites represented almost 100% of the specimens sampled, with high population density in periods with less precipitation. Among the predators, specimens belonging to the Phytoseiidae family were predominant, highlighting the species Amblydromalus zannouii Famah Sourassou, Amblyseius aerialis (Muma) and Amblyseius tamatavensis Blommers, present both in leaflets and in fruits, with the exception of A. zannouii, which was found only in leaflets.

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Evaluating damage in the perianth: a new diagrammatic scale to estimate population level of Aceria guerreronis Keifer (Acari: Eriophyidae) in coconut fruits

Cited by 3 publications

References 17 publications

Diagrammatic scale to quantify the damage caused by bean thrips to the peanut crop

Diagrammatic scale to quantify the damage caused by bean thrips to the peanut crop

Acarofauna associated with coconut fruits (Cocos nucifera L.) in a crop area from Pará state, Amazon, Brazil

Population dynamics of Aceria guerreronis and its natural enemies in coconut tree with and without application of pesticides

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