scholarly journals Removal of Bunches or Spikelets Is Not Effective for the Control of Aceria guerreronis

HortScience ◽  
2012 ◽  
Vol 47 (5) ◽  
pp. 626-630 ◽  
Author(s):  
José Wagner S. Melo ◽  
Cleiton A. Domingos ◽  
Angelo Pallini ◽  
José Eudes M. Oliveira ◽  
Manoel G.C. Gondim
Keyword(s):  
Control Strategy ◽  
Chemical Control ◽  
Distal Portion ◽  
Effective Practice ◽  
Aceria Guerreronis ◽  
Damage Level ◽  
Low Level ◽  
Coconut Mite ◽  
Diagrammatic Scale

Worldwide, there remains a reliance on repeated chemical applications as a control strategy for the coconut mite, but these are impractical, not economical, and environmentally hazardous. In this study, the damage severity of Aceria guerreronis on coconut fruits was studied under different conditions to investigate the effects of bunch management on the amount of damage to newly produced bunches. The damage was evaluated using a diagrammatic scale under four different conditions: 1) plants with bunches removed; 2) bunches with the distal portion of the spikelet removed; 3) bunches sprayed monthly with abamectin (9 g a.i./ha); and 4) control plants. For each treatment, two fruits from bunches 1 to 6 (counted from the last open inflorescence) from 10 plants were randomly collected every month for 4 months. The removal of the distal portion of the spikelets had no effect on the damage level of new bunches but delayed the damage severity by ≈1 month. After the removal of all of the bunches, the damage severity was restored within 2 months to the newly produced bunches, whereas the chemical control with abamectin kept the A. guerreronis damage intensity at a low level. Thus, the removal of bunches or the distal portion of spikelets is not an effective practice for the control of A. guerreronis in areas with high levels of infestation.

Bioactivity of cottonseed oil against the coconut mite Aceria guerreronis (Acari: Eriophyidae) and side effects on Typhlodromus ornatus (Acari: Phytoseiidae)

2017 ◽  
Vol 22 (7) ◽  
pp. 1037 ◽  
Author(s):  
Adenir Teodoro ◽  
Maria de Jesus Sousa Silva ◽  
José Guedes Sena Filho ◽  
Eugenio Oliveira ◽  
Andréia Galvão ◽  
...  
Keyword(s):  
Side Effects ◽  
Human Health ◽  
Environmental Contamination ◽  
Chemical Control ◽  
Pest Resistance ◽  
Cottonseed Oil ◽  
Aceria Guerreronis ◽  
Coconut Mite ◽  
Naturally Occurring ◽  
Major Pest

The coconut mite, Aceria guerreronis Keifer (Acari: Eriophyidae), is a major pest of coconut plantations. In Brazil, the control of A. guerreronis, when accomplished, is heavily dependent on applications of conventional acaricides, which further increases the risks associated with pest resistance, hazards to human health and environmental contamination. Therefore, the development of alternatives to the chemical control concerns outlined above is urgently needed. Here, we assessed the composition, toxicity and repellent activities of cottonseed oil to A. guerreronis and its naturally occurring predator Typhlodromus ornatus Denmark & Muma (Acari: Phytoseiidae). Our results revealed that the major compounds in cottonseed oil were linoleic and oleic acids, which have been shown to be bioactive against pests. Concentration-mortality bioassays revealed that A. guerreronis (LC50 = 0.65 μL/cm2) was more susceptible to cottonseed oil than its predator (LC50 = 5.11 μL/cm2). Similarly, as demonstrated for the conventional acaricides (i.e., abamectin, azadirachtin, espirodiclofen, and fenpyroximate), cottonseed oil was shown to repel A. guerreronis and its predator. Overall, our findings support the use of cottonseed oil as a desirable tool to be integrated in management programs aimed at controlling A. guerreronis.

scholarly journals COCONUT MITE, (Aceria guerreronis, Keifer) – Bibliography

CORD ◽  
2003 ◽  
Vol 19 (01) ◽  
pp. 34
Author(s):  
Ponniah Rethinam ◽  
Muhartoyo
Keyword(s):  
Research And Development ◽  
Chemical Control ◽  
Management Practices ◽  
Cultural Practices ◽  
Steering Committee ◽  
Future Research ◽  
Varietal Resistance ◽  
Aceria Guerreronis ◽  
Group Discussions ◽  
Coconut Mite

Coconut mite, Aceria guerreronis, Keifer, which made its first appearance as pest in Mexico in 1965 as reported by Keifer, has spread far and wide. Now that 37 years have passed. Research efforts have been made on various aspects of this pest like, origin, occurrence, dispersal, symptoms, population dynamics, management practices like chemical control, bio control, cultural practices, varietal resistance/ tolerances, natural enemies, phytosanitary efforts etc. Two international seminars/ workshops have been held. Many group discussions, steering committee meetings, etc. were also held. Lots of publications have come.  An earnest attempt has been made to collect the available literature on this pest which can benefit the member countries and others to know what has been done and what directions one has to move for future research and development. However, this bibliography is not the completed one. There may be many more and we will update as and when we get access to those references. We are confident that this bibliography will help to avoid duplication and take up need based research and development on Eriophyid mite.

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

2016 ◽  
Vol 66 (1) ◽  
Author(s):  
André Silva Guimarães Sousa ◽  
Manoel Guedes Correa Gondim Jr. ◽  
Poliane Sá Argolo ◽  
Anibal Ramadan Oliveira
Keyword(s):  
Population Level ◽  
Aceria Guerreronis ◽  
Diagrammatic Scale

scholarly journals Coconut destiny after the invasion of Aceria guerreronis (Acari: Eriophyidae) in India*

Zoosymposia ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 160-169 ◽  
Author(s):  
M. A. HAQ
Keyword(s):  
Management Practices ◽  
Critical Assessment ◽  
Bakery Products ◽  
Aceria Guerreronis ◽  
Agricultural Income ◽  
Northern India ◽  
Coconut Mite ◽  
Farming Community ◽  
The People ◽  
Considerable Damage

The coconut mite, Aceria guerreronis Keifer, has emerged as a common menace to most of the coconut plantations in India. After its first upsurge in Kerala at the end of the 1990´s, the mite has spread to many states in southern and northern India, causing considerable damage. Coconut provides one third of the agricultural income in the regions in which it is grown and more than 10 million people are dependent on this cash crop directly or indirectly through coconut-based industries like coir, copra, oil, honey, furniture, handicrafts, beverages, bakery products and so on. The economic instability of the coconut farming community and the people employed in coconut-based industries rank the highest order. A critical assessment of the various problems created by A. guerreronis in the agricultural economy of India is presented in order to supplement data on crop loss through nut malformation, nut fall, loss in fibre and copra. Varietal differences in susceptibility of the plant and future strategies in terms of management practices for an early control of the mite are discussed, and suggestions for future activities to alleviate mite damage are presented.

scholarly journals Prognostics-based adaptive control strategy for lifetime control of wind turbines

2021 ◽  
Author(s):  
Edwin Kipchirchir ◽  
Manh Hung Do ◽  
Jackson Githu Njiri ◽  
Dirk Söffker
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Control Strategy ◽  
Fatigue Loading ◽  
Operational Reliability ◽  
Operating Conditions ◽  
Rotor Blades ◽  
Time Step ◽  
Damage Level ◽  
Structural Loading

Abstract. Variability of wind profiles in both space and time is responsible for fatigue loading in wind turbine components. Advanced control methods for mitigating structural loading in these components have been proposed in previous works. These also incorporate other objectives like speed and power regulation for above-rated wind speed operation. In recent years, lifetime control and extension strategies have been proposed to guaranty power supply and operational reliability of wind turbines. These control strategies typically rely on a fatigue load evaluation criteria to determine the consumed lifetime of these components, subsequently varying the control set-point to guaranty a desired lifetime of the components. Most of these methods focus on controlling the lifetime of specific structural components of a wind turbine, typically the rotor blade or tower. Additionally, controllers are often designed to be valid about specific operating points, hence exhibit deteriorating performance in varying operating conditions. Therefore, they are not able to guaranty a desired lifetime in varying wind conditions. In this paper an adaptive lifetime control strategy is proposed for controlled ageing of rotor blades to guaranty a desired lifetime, while considering damage accumulation level in the tower. The method relies on an online structural health monitoring system to vary the lifetime controller gains based on a State of Health (SoH) measure by considering the desired lifetime at every time-step. For demonstration, a 1.5 MW National Renewable Energy Laboratory (NREL) reference wind turbine is used. The proposed adaptive lifetime controller regulates structural loading in the rotor blades to guaranty a predefined damage level at the desired lifetime without sacrificing on the speed regulation performance of the wind turbine. Additionally, significant reduction in the tower fatigue damage is observed.

The invasive coconut mite Aceria guerreronis (Acari: Eriophyidae): origin and invasion sources inferred from mitochondrial (16S) and nuclear (ITS) sequences

2005 ◽  
Vol 95 (6) ◽  
pp. 505-516 ◽  
Author(s):  
D. Navia ◽  
G.J. de Moraes ◽  
G. Roderick ◽  
M. Navajas
Keyword(s):  
Sequence Data ◽  
Common Source ◽  
Aceria Guerreronis ◽  
Dna Sequence Data ◽  
Coconut Mite ◽  
Ocean Region ◽  
Invasion Routes ◽  
History Of ◽  
Nuclear Its ◽  
Production Areas

AbstractOver the past 30 years the coconut mite Aceria guerreronis Keifer has emerged as one of the most important pests of coconut and has recently spread to most coconut production areas worldwide. The mite has not been recorded in the Indo-Pacific region, the area of origin of coconut, suggesting that it has infested coconut only recently. To investigate the geographical origin, ancestral host associations, and colonization history of the mite, DNA sequence data from two mitochondrial and one nuclear region were obtained from samples of 29 populations from the Americas, Africa and the Indo-ocean region. Mitochondrial DNA 16S ribosomal sequences were most diverse in Brazil, which contained six of a total of seven haplotypes. A single haplotype was shared by non-American mites. Patterns of nuclear ribosomal internal transcribed spacer (ITS) variation were similar, again with the highest nucleotide diversity found in Brazil. These results suggest an American origin of the mite and lend evidence to a previous hypothesis that the original host of the mite is a non-coconut palm. In contrast to the diversity in the Americas, all samples from Africa and Asia were identical or very similar, consistent with the hypothesis that the mite invaded these regions recently from a common source. Although the invasion routes of this mite are still only partially reconstructed, the study rules out coconut as the ancestral host of A. guerreronis, thus prompting a reassessment of efforts using quarantine and biological control to check the spread of the pest.

scholarly journals Geographical and seasonal distribution of the coconut mite, Aceria guerreonis (Acari: Eriophyidae), in Puerto Rico and Florida, USA

1969 ◽  
Vol 74 (3) ◽  
pp. 237-251
Author(s):  
Forrest W. Howard ◽  
Edwin Abreu-Rodríguez ◽  
Harold A. Denmark
Keyword(s):  
Puerto Rico ◽  
Florida Keys ◽  
Mite Species ◽  
Planting Density ◽  
Population Fluctuations ◽  
Aceria Guerreronis ◽  
Coconut Mite ◽  
Amblyseius Largoensis ◽  
Almost All ◽  
First Time

The coconut mite, Aceria guerreronis Keifer, was collected for the first time in Puerto Rico in 1977. It was reported for the first time in Florida in 1984, although it may have been present in the state since the 1950s. On the basis of damage symptoms observed during 1986-87, the coconut mite was distributed in almost all plantings of coconut in Puerto Rico. The percentage of trees with symptoms was highest on the west coast, where planting density is highest. During the same period, the percentage of coconut palms infested with coconut mites varied from 66 to 98% at different sites on the Florida Keys. On the Florida mainland, the percentage of trees with coconut mite damage was usually less than 7%. At several sites on the Florida mainland revisited in 1988, coconut mites had spread locally. At Playa Tres Hermanos in Añasco, Puerto Rico, and Bahía Honda Key, Florida, where monthly sampling was conducted, coconut mite population fluctuations did not appear to be strongly associated with dry and wet periods or mean daily temperatures. A list of mite species associated with the coconut mite was reported. It included four species reported for the first time in Puerto Rico. In Puerto Rico, Bdella distincta preyed on both coconut mite and Steneotarsonemus furcatus. In Florida, Amblyseius largoensis, Neoseiulos mumai, and N. paspalivorus were observed preying on coconut mites. However, these predators apparently do not significantly affect coconut mite populations. Tarsonemus sp. inflicted damage on the coconut similar to that caused by the coconut mite. Coconut mites beneath tepals of coconuts exposed to —1.5° C for 5.5 hours were not affected adversely by this treatment. Some eggs remained viable after exposure to —3° C up to 5 hours. Coconut mites survived at 5° C for 10 days. Thus, coconut mites are capable of surviving most winters on the Florida mainland.

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