scholarly journals Functional and numerical responses of the predatory mite Amblyseius aerialis (Acari: Phytoseiidae) to Aceria guerreronis (Acari: Eriophyidae)

Acarologia ◽  
2022 ◽  
Vol 62 (1) ◽  
pp. 27-35
Author(s):  
Camila Tavares Ferreira ◽  
Aloyséia Cristina da Silva Noronha ◽  
Eduardo Pereira Souza Neto ◽  
Raimundo Parente De Oliveira ◽  
Paulo Manoel Pontes Lins ◽  
...  
Keyword(s):  
Cocos Nucifera ◽  
Predatory Mite ◽  
Food Sources ◽  
Physical Barrier ◽  
Aceria Guerreronis ◽  
Coconut Tree ◽  
Coconut Mite ◽  
The Mean ◽  
Pest Mite ◽  
Cocos Nucifera L

The coconut mite, Aceria guerreronis Keifer, is one of the main pests of the coconut tree (Cocos nucifera L.) worldwide. Its control is mainly based on the use of acaricides. However, due to the habitat of this pest mite, which is protected by fruit bracts that act as a physical barrier, chemical control is often inefficient. Thus, natural enemies have been studied as an alternative to acaricides. We evaluated the functional and numerical responses of Amblyseius aerialis (Muma) to increasing densities of A. guerreronis (40, 80, 160, 240 and 360) and additionally the oviposition rates of the phytoseiid A. aerialis over 11 days on different food sources: coconut pollen, A. guerreronis and a mix of pollen and A. guerreronis. Our results showed that Amblyseius aerialis showed a type III functional response, where prey consumption increasing as the density of A. guerreronis increased, with a maximum consumption of up to 175 prey per predator. All the prey densities allowed female oviposition. The number of eggs laid by A. aerialis increased with increasing prey density and stabilized between 240 and 360 A. guerreronis individuals, with an average oviposition of 1.7 eggs/female. Furthermore, our results showed that all the food sources (coconut pollen, A. guerreronis and a mix of pollen and A. guerreronis) supported oviposition. The mean oviposition was approximately 1.5 eggs/female on all the food sources. Our study suggests that A. aerialis can be effective in the biological control of A. guerreronis. However, further studies are needed to investigate whether A. aerialis can explore the habitat of A. guerreronis and if that prey can support the development of immature stages and the reproduction of A. aerialis.

scholarly journals Incidence and seasonal occurrence ofmites (Acari) on coconut inWestBengal, India*

Zoosymposia ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 82-85 ◽  
Author(s):  
DEBJANI BANERJEE ◽  
SALIL K. GUPTA
Keyword(s):  
West Bengal ◽  
Feeding Habits ◽  
Cocos Nucifera ◽  
Seasonal Occurrence ◽  
Yield Reduction ◽  
Aceria Guerreronis ◽  
Phytophagous Mites ◽  
Coconut Mite ◽  
One Year ◽  
Cocos Nucifera L

Coconut (Cocos nucifera L.) is an important crop in West Bengal, India. The coconut mite, Aceria guerreronis Keifer (Eriophyidae), is becoming a serious threat to its cultivation in that state. This mite lives underneath the perianth, attacking the epidermis and causing damage that leads to considerable yield reduction. The same habitat was found to be shared by several other mites during a one year study in a coconut orchard in South 24 Parganas District ofWest Bengal, in 2007–2008. In total, 11 species of nine families were found in this study, including mites of different feeding habits, but mainly predatory and phytophagous mites. Neoseiulus paspalivorus (De Leon) was the predominant predator, while A. guerreronis was the predominant phytophagous species. Both were found throughout the year. The highest abundance of those species occurred in April and June, respectively. The association of N. paspalivorus and A. guerreronis has been observed in different countries and in other parts of India.

Identification prediction moisture content of Thai coconut sugar (Cocos nucifera L.) using FT-NIR spectroscopy

Food Research ◽  
2021 ◽  
Vol 5 (4) ◽  
pp. 382-385
Author(s):  
D. Thumrongchote
Keyword(s):  
Moisture Content ◽  
Cocos Nucifera ◽  
Nir Spectroscopy ◽  
Grocery Stores ◽  
Absorbance Spectrum ◽  
Coconut Tree ◽  
Cocos Nucifera L ◽  
The Cost ◽  
Non Destructive ◽  
Low Glycemic Index

Coconut sugar is a local sugar from the blossoms of a coconut tree. It has been considered a healthy sugar due to its low glycemic index. There is an attempt to add other sugar to it to lower the cost. Thus, this research aimed to identify Thai coconut sugar and to establish models for predicting the moisture content of coconut sugar by using FT-NIR spectroscopy. Thai coconut sugar samples were purchased from local grocery stores in four provinces, online, and the community market. Their moisture contents were varied and equilibrated for 24 hrs prior to the measurements of moisture and FT-NIR spectra. The results showed that FT-NIR spectra of Thai coconut sugar differ from sucrose, glucose and fructose at the absorbance spectrum of 5379-5011 cm-1 . FT-NIR spectroscopy of 54 known moisture samples of Thai coconut sugar was used to obtain a model to predict moisture content. The predicted equation, using the PLS technique with the Spectrum Quant program, was found to give a standard error of prediction (SEP) 0.077% (less than 0.10%), indicating a non-destructive method of accurately and precisely predicting moisture levels in the coconut sugar. The results obtained suggested that FTNIR spectroscopy has the potential to be used as a tool to identify Thai coconut sugar accurately. It can rapidly predict the moisture content in the sample which will be useful in quality control standards.

scholarly journals Estimating the total leaf area of the green dwarf coconut tree (Cocos nucifera L.)

2005 ◽  
Vol 62 (6) ◽  
pp. 597-600 ◽  
Author(s):  
Elias Fernandes de Sousa ◽  
Marilaine Campanati Araújo ◽  
Robson Prucoli Posse ◽  
Edenio Detmann ◽  
Salassier Bernardo ◽  
...  
Keyword(s):  
Leaf Area ◽  
Cocos Nucifera ◽  
Northern Region ◽  
Empirical Method ◽  
Total Leaf Area ◽  
Agricultural Engineering ◽  
Coconut Tree ◽  
Total Leaf ◽  
Tree Transpiration ◽  
Cocos Nucifera L

Leaf area has significant effect on tree transpiration, and its measurement is important to many study areas. This work aimed at developing a non-destructive, practical, and empirical method to estimate the total leaf area of green dwarf coconut palms (Cocos nucifera L.) in plantations located at the northern region of Rio de Janeiro state, Brazil. A mathematical model was developed to estimate total leaf area values (TLA) as function of the average lengths of the last three leaf raquis (LR3), and of the number of leaves in the canopy (NL). The model has satisfactory degree of accuracy for agricultural engineering purposes.

A new tray-type arena to mass rear Neoseiulus baraki, a predatory mite of coconut mite, Aceria guerreronis in the laboratory

2010 ◽  
Vol 29 (6) ◽  
pp. 556-560 ◽  
Author(s):  
N.S. Aratchige ◽  
L.C.P. Fernando ◽  
P.H.P.R. de Silva ◽  
K.F.G. Perera ◽  
C.S. Hettiarachchi ◽  
...  
Keyword(s):  
Predatory Mite ◽  
Aceria Guerreronis ◽  
Mass Rear ◽  
Coconut Mite ◽  
Neoseiulus Baraki

scholarly journals Status of Coconut Farming and the Associated Challenges in Kenya

CORD ◽  
2014 ◽  
Vol 30 (2) ◽  
pp. 11
Author(s):  
Pole F.N. ◽  
B. Nguma ◽  
N. Mohammed
Keyword(s):  
Cocos Nucifera ◽  
Coastal Region ◽  
Farming Systems ◽  
Baseline Survey ◽  
Aceria Guerreronis ◽  
Pests And Diseases ◽  
Coconut Tree ◽  
Nut Production ◽  
Major Pest ◽  
Planting Materials

Coconuts (Cocos nucifera) have been grown in Coastal Kenya for many centuries and are an integral part of the farming systems in the region. Over 80% of the coastal farm households derive their livelihoods either directly or indirectly from the coconut tree that is considered as both cash and a food crop. The coconut tree on the other hand has a tremendous potential of helping Kenya’s poor in the coastal region and the rest of the country due to its multi-purpose uses that can be strategically harnessed to generate employment and income, reduce edible oil imports and generate foreign exchange for the country. The tree population stands at 7.5 million palms. Nut production is however very low (a minimum of 30 nuts per tree per year) owing to a number of challenges that include high incidences of pests and diseases, poor agronomic practices, low quality planting materials and a narrow genetic base. In order to address the major challenge of coconut pests, a baseline survey was undertaken in the major coconut producing counties of coastal lowland Kenya, targeting the smallholder coconut farmers. A total 170 farmers were interviewed using a structured questionnaire. A literature review was also conducted to contextualize and benchmark findings of the survey. Results showed that the rhinoceros beetle was the major pest on coconut trees, causing damage of up to 80% of the palms. The Coreid bug (Pseudotheraptus wayi) and the Eriophyid mites (Aceria guerreronis) were the major nut destructive pests with a resultant nut loss of 30% and 40% respectively. The study stresses the need to address the challenges posed by pests and diseases on coconut by adopting the Integrated Pest and Disease Management (IPDM) practices.

scholarly journals Screening Coconut Cultivars for Tolerance to Infestation by the Coconut Mite, Aceria guerreronis (Keifer) in Sri Lanka

CORD ◽  
2014 ◽  
Vol 29 (1) ◽  
pp. 6
Author(s):  
L. Perera
Keyword(s):  
Sri Lanka ◽  
Control Method ◽  
Cocos Nucifera ◽  
Mite Infestation ◽  
Crop Loss ◽  
Field Observations ◽  
Aceria Guerreronis ◽  
Yield Data ◽  
Damage Initiation ◽  
Coconut Mite

The coconut mite (Aceria guerreronis Keifer) is a tiny pest which severely damages the nuts of the coconut palm (Cocos nucifera Linnaeus). At present there is no appropriate control method for this pest in Sri Lanka. Field observations have revealed difference in the severity of A. guerreronis mite infestation among selected and improved coconut cultivars in Sri Lanka. This difference has not been studied in depth and therefore the present study was conducted to investigate the levels of tolerance in selected and improved coconut cultivars and, if differences were demonstrated, to understand the mechanism behind the tolerance. A replicated trial in Thammenna Estate (TE) in Puttalam district in Sri Lanka, where the mite infestation was natural and severe, was selected for this study.  The trial was planted in 1983 and consisted of two improved coconut cultivars; Sri Lanka Yellow Dwarf x Sri Lanka Tall (YDT) and Sri Lanka Green Dwarf x Sri Lanka Tall (GDT) and the selected Sri Lanka Tall cultivar (TT) which has, green (TTG) and russet coloured (TTR) forms.  Population assessment of mites on immature nuts, damage initiation of the fourth bunch and harvest records were obtained. Further, characters that were thought to influence tolerance, such as nut shape as measured by ratio of length to breadth, the tightness of perianth to the nut surface and some changes in the affected tissues were also recorded. Yield data were collected for each cultivar to estimate the crop loss due to coconut mite damage. The results revealed that out of the cultivars tested in this trial, YDT had the lowest incidence of mite colonization and the smallest mite population size and symptom initiation compared to others. The distance between the perianth and nut surface, the least in YDT, is suggested as the most probable morphological feature that would impart tolerance to mite infestation.

scholarly journals Evaluation des similitudes agromorphologiques des géniteurs et descendances F1 dans le croisement de cocotiers (Cocos nucifera L.) Nain Jaune Malaisie x Grand de Vanuatu (NJM x GVT) en Côte d’Ivoire

2020 ◽  
Vol 147 ◽  
pp. 15125-15139
Author(s):  
KOFFI Eric-Blanchard Zadjéhi ◽  
YOBOUE Koffi ◽  
YAO Saraka Didier Martial ◽  
KONAN Jean Louis ◽  
SIE Raoul Sylvère ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cocos Nucifera ◽  
Coconut Palm ◽  
Male Parent ◽  
Cote D’Ivoire ◽  
Coconut Tree ◽  
Côte D'ivoire ◽  
Cocos Nucifera L ◽  
Cultivation Techniques

Objectifs : L’étude a été conduite pour évaluer la ressemblance agromorphologique des descendances hybrides F1 NJM x GVT à celles de leurs géniteurs en Côte d’Ivoire en vue de prédire les caractéristiques des descendants et adopter des techniques culturales et utilisations appropriées. Méthodologie et résultats : Trente variables ont été mesurées sur 18 descendances et leurs géniteurs mâles GVT et femelle NJM. Il ressort que les caractéristiques végétatives des descendances NJM x GVT sont relativement proches de leurs géniteurs mâles GVT. Les héritabilités varient de 10 % à 40 % pour l’ensemble des descripteurs. Elle est plus élevée pour C20, LGF, ILE, ILPRF et Déq avec une valeur de 40 % qui ont plus contribué au rapprochement des descendances de leur géniteur mâle. Des gains agromorphologiques par rapport aux deux géniteurs sont observés pour la plupart des caractères. Les taux varient en moyenne de 0,73 % à 84,26 % selon le caractère et le géniteur. Conclusion et applications des résultats : Ces résultats serviront de guide aux sélectionneurs quant aux résultats attendus d’une descendance F1 de cocotier Grand croisé par cocotier Nain. Ces hybrides peuvent être cultivés et utilisés de la même manière que leur géniteur mâle. Mots clés : Cocotier, caractéristique agromorphologique, hybride NJM x GVT, héritabilité, gain. Assessment of agromorphological similarities between parents and F1 progenies in the crossing of Dwarf Malayan x Vanuatu Tall coconuts in Côte d’Ivoire ABSTRACT Objectives: The study was conducted to assess the agromorphological resemblance of the F1 NJM x GVT hybrid progenies to those of their parents in Côte d'Ivoire in order to predict the characteristics of the descendants and adopt appropriate cultivation techniques and uses. Methodology and results: Thirty variables were measured on 18 descendants and their male parents GVT and female NJM. It appears that the vegetative characteristics of the NJM x GVT descendants are relatively close to their male GVT sires. Heritability ranges from 10% to 40% for all descriptors. It is higher for C20, LGF, ILE, ILPRF and Déq with a value of 40% that contributed more to the approximation of the descendants of their male parent. Agromorphological gains compared to the two spawners are observed for most characters. The rates vary on average from 0.73% to 84.26% depending on the trait and the sire. Conclusion and application of the results: These results will serve as a guide for breeders as to the expected results of an F1 offspring of large coconut palm crossed by Dwarf coconut tree. These hybrids can be grown and used in the same way as their male parent. Key words: Coconut palm, agromorphological characteristic, NJM x GVT hybrid, heritability, gain.

Acute and non-lethal effects of coconut oil on predatory mite Typhlodromus ornatus (Acari: Phytoseiidae)

2018 ◽  
Vol 23 (7) ◽  
pp. 1333 ◽  
Author(s):  
Giselle Freitas ◽  
Maria Clezia Santos ◽  
Vanessa Lira ◽  
Andreia Galvão ◽  
Eugenio Oliveira ◽  
...  
Keyword(s):  
Side Effects ◽  
Functional Response ◽  
Vegetable Oils ◽  
Natural Enemy ◽  
Coconut Oil ◽  
Predatory Mites ◽  
Predatory Mite ◽  
Aceria Guerreronis ◽  
Lethal Effects ◽  
Coconut Mite

Typhlodromus (Anthoseius) ornatus Denmark & Muma (Acari: Phytoseiidae) is one of the predatory mites associated with the coconut mite Aceria guerreronis (Acari: Eriophyidae), a serious coconut pest in Africa, Asia and America. Vegetable oils such as coconut oil have been shown to efficiently control A. guerreronis, however their side effects on predatory mites remain poorly investigated. Here, we evaluated the lethal and non-lethal effects of coconut oil on repellence and functional response of the predatory mite T. ornatus, a natural enemy of A. guerreronis. Based on LC50 estimates, coconut oil was over 6-fold less toxic to T. ornatusthan to its prey, A. guerreronis. Additional repellence and predation bioassays show that the coconut oil neither repels nor interferes in the functional response of T. ornatus preying upon A. guerreronis. According to our selectivity approach, the coconut oil is compatible with the predatory mite T. ornatus. 

Sign in / Sign up

Export Citation Format

Share Document