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Abundance and Diversity of Insects Associated with Citrus Orchards in Two Different Agroecological Zones of Ghana

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Abundance and Diversity of Insects Associated with Citrus Orchards in Two Different Agroecological Zones of Ghana American Journal of Experimental Agriculture 13(2): 1-18, 2016, Article no.AJEA.26238 ISSN: 2231-0606 SCIENCEDOMAIN international www.sciencedomain.org Abundance and Diversity of Insects Associated with Citrus Orchards in Two Different Agroecological Zones of Ghana Owusu Fordjour Aidoo 1,2*, Rosina Kyerematen 1,3, Clement Akotsen-Mensah 1,4 and Kwame Afreh-Nuamah 1,4 1African Regional Postgraduate Programme in Insect Science, University of Ghana, Legon, Accra, Ghana. 2International Center of Insect Physiology and Ecology (ICIPE), Box 30772-00100, Nairobi, Kenya. 3Department of Animal Biology and Conservation Science, University of Ghana, Legon, Accra, Ghana. 4Forest and Horticultural Crops Research Centre, School of Agriculture, College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana. Authors’ contributions This work was carried out in collaboration between all authors. Author OFA designed the study, performed the statistical analysis, wrote the protocol and wrote the first draft of the manuscript. Authors CAM and RK managed the analyses of the study. Author KAN managed the literature searches. All authors read and approved the final manuscript. Article Information DOI: 10.9734/AJEA/2016/26238 Editor(s): (1) Marco Aurelio Cristancho, National Center for Coffee Research, CENICAFÉ, Colombia. (2) Daniele De Wrachien, State University of Milan, Italy. (3) Vincenzo Tufarelli, Department of DETO - Section of Veterinary Science and Animal Production, University of Bari "Aldo Moro", Italy. Reviewers: (1) Anibal Condor Golec, MSc Organic Plant Production, Lima, Peru. (2) Barbara Carolina Garcia Gimenez, Federal University of Paraná (UFPR), Brazil. (3) James Kehinde Omifolaji, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, China. Complete Peer review History: http://sciencedomain.org/review-history/15293 Received 6th April 2016 Accepted 13 th June 2016 Original Research Article th Published 7 July 2016 ABSTRACT We investigated the abundance and diversity of entomofauna associated with citrus orchards in two different agroecological zones of Ghana. Malaise traps, flight interception traps, pitfall traps, chemical ʽʽ kn ock down’’ and visual observation were used for data collection. We recorded a total of 20, 285 individual insects belonging to 387 species from 107 families and 13 orders. Although, several species of insects were common to both agroecological zones, some were more specific to _____________________________________________________________________________________________________ *Corresponding author: E-mail: [email protected]; Aidoo et al.; AJEA, 13(2): 1-18, 2016; Article no.AJEA.26238 an orchard of a particular zone. Diversity indices such as Shannon-Wiener index, Pielou’s evenness and Margalef index were higher in the Coastal Savannah zone than the Semi-Deciduous Rainforest zone during both the wet and the dry seasons . Oecophylla longinoda Latreille was the most dominant insect species in each agroecological zone, however, they were more abundant in the semi-deciduous rainforest than the Coastal Savannah zone. Our study shows that only 9% of all the 387 insects collected were pests of citrus. This indicates that citrus orchards are potential habitats for insect biodiversity conservation. We therefore recommend that management tactics which have less or no negative effects on natural enemies, pollinators among others but can effectively suppress insect pest populations (such as the use of biological control agents, restriction of herbicides and pesticides) should be adopted. Our study has also provided the first comprehensive inventory of insect species associated with citrus agroecosystems serving as a baseline data for further studies to encourage adoption of economically sound integrated pest management approach for citrus production in Ghana. Keywords: Insect diversity; abundance; integrated pest management; Oecophylla longinoda; citrus. 1. INTRODUCTION diversity and abundance. Insects which were previously considered as minor pests are Insects constitute the most dominant component emerging as key pests in many agroecosystems. of terrestrial and freshwater biodiversity in terms There is also evidence that honeybees and other of species richness, animal biomass and critical pollinators, such as flies, butterflies and major ecological functions [1]. They have invaded every bioindicators such as ants and beetles are in niche, except the oceanic benthic zone [2]. decline across the globe [10]. Anthropogenic Estimates of species richness of insects have climate change threats to insect biodiversity are been reported to vary from 2 million to as many global. The quickened rate of environmental as 50 million [3]. Insects are very sensitive to deterioration could lead to a loss of human-mediated disturbances, habitat loss, whole taxonomic groups. In Ghana, [11] pollution and climate change, and because of reported an annotated list of insects associated their sensitivity several insect taxa are used as with citrus plantations at Kade in the indicators of global change [4]. The majority of Semi-Deciduous Rainforest zone, however, insects on earth are important to humans: A knowledge of diversity and abundance of insects few are harmful such as agriculture pests associated with citrus agroecosystems in and disease vectors whereas others are different agroecological zones is poorly beneficial such as decomposers, seed understood. dispersers, pollinators and natural enemies of pests [5]. To manage natural resources, restore disturbed habitats or conserve valuable species of Pesticides are used in conventional farming to concern, the biodiversity of insects of suppress pest populations below economic specific areas or target habitats needs to be threshold levels and research has shown that assessed. However, this requires a more arthropod taxa were found in non-sprayed comprehensive but efficient inventory of the fields together with greater numbers of predators organisms and perhaps their role in the such as Coccinellids than in fields treated with ecosystem [12]. This underscores the broad-spectrum insecticides and herbicides [6]. critical necessity of this biodiversity study to gain Reduction in bumblebees and butterflies has an in-depth knowledge of diversity and been observed in farms with higher pesticide abundance of insects associated with citrus application than those with no or lower pesticide agroecosystems to help implement measures application [7]. In Ghana, control of major pests that ensure the conservation of biodiversity and of citrus relies on pesticide application [8] and the maintenance of agricultural lands to enhance herbicide application is one of the weed agricultural productivity and sustainability in management practices adopted by farmers [9]. Ghana. These herbicides do not only deprive insects of their source of food but also directly kill them. The aim of this study was to determine the diversity and abundance of entomofauna After citrus establishment, insect species associated with citrus plantations in two different colonize and over time progressively increase in agroecological zones of Ghana. 2 Aidoo et al.; AJEA, 13(2): 1-18, 2016; Article no.AJEA.26238 2. MATERIALS AND METHODS insects. One malaise trap was set in each zone to collect mainly flying nocturnal insects; 2.1 Sampling Zone one flight interception trap was used for both ground crawling insects and flying insects by We conducted our study in citrus orchards intercepting their flights. Hand picking was used (monoculture) in the Semi-Deciduous Rainforest for collecting specifically slow moving insects and and Coastal Savannah agroecological zones. In those which play dead when the vegetation is both orchards, weed management was by the disturbed. Chemical knockdown was used to use of machetes, and both farms were wholly collect insects in the canopy of the citrus trees: organic with the citrus variety being Late 10 trees were randomly selected during each Valencia. In the Semi-Deciduous Rainforest sampling period and sprayed with CYDIM super zone, the research was carried out in a citrus (an emulsifiable concentrate containing 36 g plantation (CI. 25) of the Forest and Horticultural cypermethrin and 400 g dimethoate active Crops Research Centre (FOHCREC) at ingredient/L) at a rate of 120 ml insecticide/ha Okumaning, Kade in the Kwaebibirem District of using a motorized mist blower early in the the Eastern Region of Ghana. This area morning between 6:00-10:00 am. Pieces of vinyl experiences an annual bimodal rainfall pattern sheets measuring 2.8 m × 8 m were ranging between 1200-1300 mm, temperature placed beneath the selected trees to collect any range of 25-38°C [13]. The coordinates of the insect that fell from the trees during and after site were N 06°09.473 ꞌ, W 000 54.550 ꞌ and E: spraying. 552ft. The orchard was established 20 years ago with a triangular planting distance of 6m x 6m. 2.3 Identification of Insects The vegetation in the study site consisted mainly of Panicum maximum and Pueraria Insects were preserved in 70% ethanol, sorted, phaseoloides . In the Coastal Savannah zone, the identified to the lowest taxonomic rank possible research was carried out in a farmer’s plot at and counted. Identification of insects was done Asuansi Agriculture Research Station in the with reference to collection in the museum of the Abura/Aseibu/Kwamankesse District of the Department of Animal Biology and Conservation Central Region of Ghana. The area experiences Science (DBCS), University
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