Cylas formicarius pdf
Insect pests of sweetpotato are best controlled by integrated pest management (IPM) approaches. After insect feeding by sweet potato weevils, an extremely bitter taste thus induced render the sweet potatoes unsuitable for further consumption, and the yield losses caused by sweet potato weevil damage range from 5% to 80% [4-6]. The larvae or grubs do the most damage, and this is similar to that caused by the sweetpotato weevil,Cylas formicarius.
Cylas formicarius has rapidly expanded its distribution area towards southwestern islands of Kagoshima Prefecture since it was found in Okinawa Islands. The highest pests found was in red sweet potato (30.33%) and lowest for the orange sweet potato (18.67%). Cylas formicarius is a destructive pest of sweet potato throughout most of the tropical and subtropical regions and occurs in several African countries. The immature insect feeds on roots, making the tubers ugly in appearance and inedible due to the bitter flavor and rotten smell that develops. Cylas Formicarius The female weevil lays eggs at the base of the stem and in the tuber.
These metrics are regularly updated to reflect usage leading up to the last few days. Damage Adult weevils feed on leaves, the underground storage roots (tubers) and the vines of sweet potatoes. Adults feed on stems and leaves and excavate small cavities in which to lay eggs. Cylas formicarius is considered the single most important pest of sweetpotato.Weevil infestation ranges from 20 to 50% on many farms and can even reach to 100% depending on the season and variety.Higher infestation occurs during dry seasons. Sweet potato weevil (SPW) Cylas formicarius (Fab.) is the important insect pest throughout the world, wherever it is grown. Journal of Root Crops, the official publication of the Indian Society for Root Crops, publishes scientific papers, short scientific reports, original reviews and book reviews on all aspects pertaining to tropical root and tuber crops.
Full Text PDF [357K] Abstracts References(42) Cited-By(3) Genetic variations of the internal transcribed spacer-1 region in sweet potato weevil, Cylas formicarius, were examined from 27 collection sites in the main infested areas in the world, except Africa, in this study. This treatment applies to the irradiation of fruits and vegetables at 165 Gy minimum absorbed dose to prevent the development of F1 adults of . The predators of the SPW, including mite, ants, and mice have been reported [22,23]. Gurr1,2,3,4,5 Mulching with organic materials is a management practice with long history for weed suppression, soil water conservation and erosion control. The objective of this study was to obtain the effective and efficiency control technique of sweetpotato weevils.
This document is EENY-027 (IN154), one of a series of Featured Creatures from the Entomology and Nematology Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. W-250 had the least number of feeding punctures and eggs at 7 and 25 days after harvest. Results showed that the funnel type PET bottle trap baited with 1 mg of synthetic sex pheromone dispen- sed in polyethylene microtube was more effective, inexpensive, and ease to be used for trapping male weevils than any other designs. In the storage roots, tunnelling produces chemicals called terpenes, which give the flesh an unpleasant taste. Reaction of sweet potato varieties to the damage of the weevil, Cylas formicarius (Fab.)(Coleoptera: Curculionidae) and on the possibility of picking up of infestation by weevil. Alex Sybron, Senior Plant Protection Officer, Plant Protection Unit, Research and Development Division, MICAF Collaborators: Dr. To accomplish this, we seek to build strong relationships with our customers that go well beyond the sale of products. The sweet potato weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae), is a destructive insect pest that damages sweet potatoes both in the field and during storage.
Hosts and damage: One of the most destructive pests of sweet potato (Ipomoea batatas). Cylas formicarius spends most of its life cycle within the vine or swollen root, which provides some protection for the developing weevils.
Holes used by the adults to exit the stems can be seen.
Control of the weevils is by dipping the cuttings in dia zinon before planting, by rotation of the crop, and by spraying with diazinon. Damage from the pest attacks can reduce yields up to 97% and even minor damage causes sweet potatoes cannot be consumed because they taste bitter and toxic. In first generation, the highest egg period was recorded in Co-3 (White) (5.50 days). The larvae tunnel through the base of the stem (crown) and through the storage roots. Cylas formicarius with one hundred per cent adult mortality after 72 hours of exposure and their LD 50 and LD 90 values were 0.49 and 0.81; 1.67 and 4.34µg/insect respectively. When applied using density 50 IJs/ml against Cylas formicarius, the nematode population grew up to ca. Generally, a serious damage can occur during tuber in storage period (Kalshoven, 1981).
In order to know the relationship between TI and mating behavior, we investigated the cost–benefit between TI and mate search in the sweetpotato weevil (SPW), Cylas formicarius. Acknowledgements: this project was supported by FY 2011 Pacific Islands Area Conservation Innovation Grants (PIA-CIG) Program, Grant Agreement No.
All structured data from the file and property namespaces is available under the Creative Commons CC0 License; all unstructured text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. Keywords: Cylas formicarius, host plant resistance, sweet potato, volatile organic compounds. The elongated ant-like adults of the three species can be distinguished from each other. Efficacy of Biopesticide Be-Bas against Sweet Potato Weevils (Cylas formicarius Fabricius) in Tidal Land In Indonesia tidal land is very wide and quite potential for sweet potatoes, but an obstacle for this cultivation is sweet potato weevil ( Cyla s formicarius ) causes loss of 100%. Roots of four genotypes (“W-244”, “W-250”, "‘Beauregard”, “Centennial”) were evaluated for SPW feeding and oviposition at three different storage times. The female lays its eggs in stems and roots and the larvae make galleries in the tubers which affects flavour (Dias Sanchez, 1980). The larvae or grubs do the most damage, and this is similar to that caused by the sweetpotato weevil, Cylas formicarius. The life stages of Cylas formicarius in sweet potato tubers were assessed during first and second generations.
In India, a few genotypes of sweet potato have shown durable resistance throughout 2006 to 2011. The weevil is managed by a package of practices together called integrated pest management (IPM). Cylas formicarius is a pest that directly reduce the quality and quantity of sweet potato. The objective of this study was to evaluate the level of resistant of varieties and the frequencies of hilling-up that could minimize the damage caused by hama boleng on sweet potato. puncticollis, morphometric studies, southern Ghana Introduction Sweet potato is one of the world’s most important food crops in terms of human consumption, particularly in Sub-Saharan Africa, parts of Asia, and the Pacific Islands.
Full Text PDF [559K] Abstracts References(13) Cited-By(4) We examined daily flight patterns and the correlation between adult age and flight in Cylas formicarius in the laboratory at 25 ± 1 °C under a 14L10D photoregime by a simple method of counting the number of adults flying out of a cup. for sweetpotato weevil (Cylas formicarius) and one nematicide for root knot nematode (Meloidogyne spp.) have been investigated as part of replicated field and pot experiments undertaken by the project. Adult is slender ant like with a long snout and shiny black with reddish brown thorax and legs.
Login to save searches and organize your favorite content.
Sweet potato is the main staple crop in PNG and this paper presents a study from the humid lowlands of the Morobe Province. Other names include the sweet potato root borer or the African sweet potato weevil. Storage roots produced under drought or normal conditions were tested for adult feeding, oviposition, larval survival and pupal weight in the laboratory under no-choice and free-choice test conditions.
Davis, Host preference of sweetpotato weevil, Cylas formicarius elegantulus (Summers): an example of Hopkins’ host-selection principle, Arthropod-Plant Interactions, 10.1007/s11829-019-09704-0, (2019). For the past 12 years we have been screening sweetpotato germplasm for resistance to this pest in order to breed an agronomic cultivar with weevil resistance.
This pest is therefore one of the main limiting factors for the production of sweet potato. For this reason, the first attempts at chemical control were usually not successful due to the lack of systemic insecticides (Sutherland 1986a). Death feigning is fairly common in a number of taxa, but the adaptive significance of this behaviour is still unclear and has seldom been tested. Adults are antlike, shiny beetles 5–6 mm long, with a narrow head and pronotum, long legs and a slightly distended body. Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. In this study, we used Y-tube olfactometer and determined that male mate searching increase after 3 h at night. known as the sweet potato weevil, Cylas formicarius elegantulus Summers, defined as an insect pest under the provisions of Code of Ala.
The larvae then tunnel through the tuber, feed on it and depositing fras with it. It is reported to cause losses ranging from five to 97% in areas where it infests .
to damage by the weevils, Cylas formicarius elegantulus (Summers) and Eucepes and postfasciatus (Fairmaire) In this research, weevil numbers and the percentage of tubers and stems damaged by weevils were studied in thirty clones of sweet, potato, which had either thin, medium or thick vines. Estos libros contienen ejercicios y tutoriales para mejorar sus habilidades prácticas, en todos los niveles!
It is originally from Indonesia where it is found on the wild plants of the genus Ipomea (Zimmerman, 1994). Our purpose is to manufacture high quality products that our customers can employ to reduce or eliminate the use of pesticides. Larvae or grubs of sweetpotato weevil, Cylas formicarius, damaging a vine at the crown where the stem enters the ground. Wireworms, cucumber beetles, white grubs, flea beetles, and various foliar pests also may occur. Cylas formicarius Sweetpotato weevil larvae tunnel in the stems and storage roots of sweetpotatoes, making the roots unusable. the growth and development of sweet potato weevil, Cylas formicarius Fabricius under laboratory conditions.
Indian Journal of Entomology 55: 162 – 169 Hwang, J.S.
Figure 2.Changes in establishment and potential distribution of the sweetpotato weevil, Cylas brunneus, in sweetpotato production systems worldwide according to model predictions, using the ERI for the years 2000 (A) and 2050 (B), and changes of the ERI between 2000 and 2050 (C).An ERI>0.95 is associated with potential permanent establishment. Sweet potato weevils of the genus Cylas (Coleoptera: Brentidae) are considered to be globally the most important pests of sweet potato [Ipomea batatas (L.) Lam.] (1). Bucket light trap powered with 12V battery Malaise trap Setting yellow sticky traps in an agricultural field . Results show the double-funnel PET bottle trap baited with 1 mg of synthetic sex pheromone dispensed in polyethylene microtube was more effective, inexpensive, and ease to use for trapping male weevils than any other de. Sweet potato weevil (Cylas formicarius elegantulus) which feeds on all parts of host plants, but primarily roots or tubers. To minimise the immigration of weevils into sweetpotato fields from nearby donor habitat, we assessed scope for a barrier plant approach. Many exotic insects have invaded Okinawa, some of which are now established in this . microplus and insecticidal activity on Cylas formicarius elegantulus, two economically important pest species [2g].
It causes economic damage in areas with a marked dry season or in unseasonally dry years (Bourke 1985). Overall, sweetpotato weevil trap catch was significantly affected by the number of windows in the trap, the killing agent used in the trap and the position of the trap relative to sweetpotato foliage, while trap size and trap colour did not significantly affect trap catch. When SPW is stimulated by a predator or other external stimuli, the body becomes motionless, and fall from the host plants. postfasciatus adults, and 30,282 O.anastomosalis pupae at a dose of 150 Gy resulted in no production of F 1 adults, demonstrating that this dose is sufÞcient to provide quarantine security.