The swimming behavior of the rice water weevil Lissorhoptrus oryzophilus Kuschel (Coleoptera: Curculionidae) is unique in comparison to that of most other aquatic weevils. and you may need to create a new Wiley Online Library account. The rearing method of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, was studied in a laboratory and a greenhouse by using a rice plant and a barnyard millet. The entire time required for passing the immature stages in the insectary, from deposition of the egg to transformation to the adult stage, may be as brief as 32 days and as long as 77 days. 3 Yield losses were due to a combination of decreases in panicle densities, numbers of grains per panicle, and grain weights. Working off-campus? In choice studies, female weevils showed a marked ovipositional preference for plants flooded to a depth of 10.2 cm over unflooded plants and plants flooded to a depth of 1.3 cm. The adults collected in the paddy field in Mie pref. The eggs are deposited in the roots, and the female beetles will not deposit eggs unless these roots are submerged. Water management is a potentially effective means of managing rice water weevil because rice water weevil adults, eggs, and larvae are affected by draining flooded fields. If you have previously obtained access with your personal account, please log in. The Journal of the Kansas Entomological Society provides a forum for entomologists and all other researchers interested in insects or other terrestrial arthropods, their evolution, ecology, behavior, systematics, genetics, physiology, economic uses or control, and conservation. Thus, flooding may influence rice water weevil behavior both directly, by acting as a stimulus for feeding or oviposition, and indirectly, by inducing changes in the suitability of rice plants for feeding or oviposition. The adults appear to be adapted to respiration in low oxygen pressures (commonly met with on the roots of the plants during the winter) but not to the complete absence of oxygen. This item is part of JSTOR collection The mud surrounding the larvae and roots is anoxic. 1 in the Same checks mature larvae were found on the roots of rice and water grasses. The parthenogenic weevil, first detected in Tanghai County of Hebei Province in 1988, has become one of the major rice pests in China with yield loss of 10–80%. Experiments and observations were conducted to investigate some of the physical and behavioral adaptations of larvae and pupae of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, for living in flooded conditions, with the ultimate goal of improving methods for rearing this insect in the laboratory. Abstract  1 The effects of feeding by larvae of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, on the growth and yield components of rice, Oryza sativa, were evaluated using four varieties of rice, ‘Cocodrie’, ‘Cypress’, ‘Bengal’ and ‘XP1003’, over 2 years. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, I have read and accept the Wiley Online Library Terms and Conditions of Use, Journal of the Kansas Entomological Society, 10.2317/0022-8567(2006)79[176:AOLAPO]2.0.CO;2, ROLE OF VARIETAL RESISTANCE IN MANAGING THE RICE WATER WEEVIL, A MAJOR INSECT PEST OF LOUISIANA RICE, A Century of Rice Water Weevil (Coleoptera: Curculionidae): A History of Research and Management With an Emphasis on the United States, Variation of Body Size in Rice Water Weevil (Coleoptera: Curculionidae) and Its Associations with Population Biology, Impact of Water Management on Efficacy of Insecticide Seed Treatments Against Rice Water Weevil (Coleoptera: Curculionidae) in Mississippi Rice, The Efficacy of Bacillus thuringiensis spp. Reductions in numbers of grains per panicle and grain weights probably resulted from decreases in shoot biomass. The head-capsule widths of each instar were: 1st, 0.14 to 0.18 mm; 2nd, 0.20 to 0.26 mm; 3rd, 0.28 to 0.38 mm; and 4th, 0.40 to 0.60 mm. The immature stages of the rice water weevil, Lissorhoptrus simplex (Say), are passed entirely below the water, either in or among the roots of rice and other aquatic grasses. Heat shock and cold shock increased the expression of all three hsps, and the highest upregulation was observed at 40°C, although the intensity of upregulation varied among the three genes: strongly in Szhsp70, moderately in Szhsp90, and slightly in Szhsc70. Feeding by L. oryzophilus larvae resulted in extensive damage to root systems. Its quarterly publication, the Journal of the Kansas Entomological Society, now in its 80th annual volume, contains papers by local authors as well as by persons from many other parts of the world. The oxygen uptake may be depressed after the exposure to the lowered oxygen conditions compared with the initial rate in air or an oxygen debt may be accumulated. Rice water weevil - Lissorhoptrus oryzophilus Kushel Each yellow circle surrounds a rice water weevil larva. Presence and depth of flood influenced both the proportion of females that oviposited in plants and the number of eggs laid by those females that did oviposit. A detailed description of the larval tracheal system is presented. This pest has been found in eleven provinces and two large municipal areas infesting over 400,000ha by late 2003. Decreases in panicle densities were a direct result of the reductions in tiller numbers. © 2006 Kansas (Central States) Entomological Society Feeding by rice water weevil larvae results in stunted root systems, reduced tillering, reduced number of grains per panicle, and reduced grain weight (Zou et al. Larvae have hydrophobic exocuticles and well-developed tracheal systems which are adapted for breathing in air. Galleriae Against Rice Water Weevil (Coleoptera: Curculionidae) for Integrated Pest Management in California Rice, NEOCHETINA SPECIES AND ARTHROPOD COMMUNITIES IN WATER-HYACINTH RAFTS IN SOUTH CAROLINA, Soil abiotic factors influence interactions between belowground herbivores and plant roots. The legs are moved synchronously during protraction and retraction. 1 per cent) in two ways. When larvae were placed in water, the hydrophobic properties of the exocuticle resulted in a very thin layer of air between the surface of larval body and water. The pro- and metathoracic legs serve as diving planes and provide stability The average rice water weevil swimming speed was 1.53 (+/-0.15 SE) cm per s with a range of 0.88 to 2.52 cm per s. Weevils averaged 5.67 (+/-0.22 SE) strokes per s. The mode of swimming by L. oryzophilus differs from those described for Phytobious leucogaster (Marsham) (= Litodactylus leucogaster), P. comari (Herbst), Bagous cavifrons LeConte, B. americanus LeConte and B. limosus Gyllenhal. Expression levels of three hsps—Szhsp70, Szhsc70, and Szhsp90—fluctuated substantially throughout the four stages at a rearing temperature of 28°C. With a personal account, you can read up to 100 articles each month for free. Females deposit their eggs in the submerged leaf sheath or beneath water line of plant or in the roots. Zhitao Zhang, Michael J. Stout, Hanwu Shang and Ryan C. Pousson, Journal of the Kansas Entomological Society, Published By: Kansas (Central States) Entomological Society, Read Online (Free) relies on page scans, which are not currently available to screen readers. This brings the modes of free swimming (exclusive of skating) to at least 3 by adult aquatic curculionids. The response depended on the initial QO2 in airand the pO2 experienced. If you do not receive an email within 10 minutes, your email address may not be registered, Propulsion during swimming is provided only by the mesothoracic legs. Adults oviposit after floods are established, and greenhouse studies have shown that plants exposed to deep floods have more eggs oviposited in leaf sheaths than plants exposed to a shallow flood. of rice water weevil larvae, were noted, and were thought to be used to penetrate rice root tissues to obtain air. The larvae of the next generation obtained from these adults were reared in the biotron (25±1°C, 16L8D), Greenhouse A (25-32°C, 16L8D), and Greenhouse B (20~32°C, 16L8D). It also differs from descriptions of swimming for other aquatic Coleoptera and Hemiptera. As part of an effort to develop strategies to manage this pest, the ovipositional and feeding habits of L. oryzophilus on rice plants subjected to different flooding treatments were characterized in greenhouse studies. The rice water weevil, Lissorhoptrus oryzophilus Kuschel, was determined to have four instars, based on measurements of head-capsule widths of field-collected larvae. The Society provides a forum for entomologists and welcomes as members all persons interested in insects or other terrestrial arthropods, their ecology, behavior, systematics, physiology, control, conservation, etc. Login via your JSTOR®, the JSTOR logo, JPASS®, Artstor®, Reveal Digital™ and ITHAKA® are registered trademarks of ITHAKA. The adult weevil when ready to deposit eggs crawls down the rice stem and in- serts the ovipositor in one of the prin- cipal roots forcing the ovipositor through The rice water weevil, Lissorhoptrus oryzophilus Kuschel, has long been an important pest of rice in the U.S. and has recently emerged as a pest of rice in Asia. The purpose of the experiments presented in this paper was to investigate methods for rearing larvae and pupae of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, on rice plants in a laboratory in the absence of mud. The Society holds annual meetings in Kansas or nearby states, at which students as well as established entomologists present results of their research or reviews of topics of interest. Larvae could also secure an adequate supply of oxygen directly from air, as indicated by survival rates of larvae placed individually in test tubes without water but under conditions of high relative humidity. in May, 1988 were reared on a rice plant. Return to overwintering sites began in early June and continued until October. Unlimited viewing of the article/chapter PDF and any associated supplements and figures. Louisiana State University Rice Research Station, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA, U.S.A. Use the link below to share a full-text version of this article with your friends and colleagues. 4 Injury by rice water weevil larvae is chronic. The weevil's life history, population dynamics, host–plant relationships and mode of establishment have been studied at a number of locations. The rice water weevil, Lissorhoptrus oryzophilus (Kuschel) (Coleoptera: Curculionidae), is a semi-aquatic pest of rice and is the most destructive insect pest of rice in the United States. Quarantine measures did not effectively limit the spread of rice water weevil due to its parthenogenesis, flying, swimming and hitchhiking on human transportation.


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