They will typically clump in areas adjacent to the levee and feed within several meters of the edge of the field (Sooksai and Tugwell 1978, Espino 2012). Adult feeding appears as linear slits of varying length on the upper surface of the leaves but generally does not cause economic losses. 1981). Baton Rouge, LA 70803.

B. The female uses strong mandibles to chew a hole into a grain kernel after which she deposits a single egg within the hole, sealing it with secretions from her ovipositor.

Rice water weevil plant damage from greenhouse study. G.W.

Adults are most active during the evening and night.

1989). Proceedings, 35th Rice Technical Working Group, Rice plant density effect on rice water weevil (Coleoptera : Curculionidae) infestation, Planting date as a potential cultural method for managing the rice water weevil (Coleoptera : Curculionidae) in water-seeded rice in southwest Louisiana, Water management as a cultural control tactic for the rice water weevil (Coleoptera : Curculionidae) in southwest Louisiana, Efficacy of selected seed treatments for control of rice water weevil in Arkansas, Plant-mediated interactions between the rice water weevil and fall armyworm in rice, Use of common weeds of rice as hosts for the rice water weevil (Coleoptera: Curculionidae), Evaluation of the potential role of glufosinate-tolerant rice in integrated pest management programs for rice water weevil (Coleoptera: Curculionidae), Effects of the presence of barnyardgrass on rice water weevil (Coleoptera: Curculionidae) and rice stink bug (Hemiptera: Pentatomidae) populations on rice. Kölbl Chemical control is still the main management option for growers against rice water weevil (Flint et al. J. Stout Davis Palrang It also is toxic to newly laid eggs, i.e., those that are less than 4 days old. Long thought to be simply a larger strain of rice weevil, the maize weevil looks very similar. Heagler The rationale for this method is to delay the onset of oviposition by rice water weevils, allowing the plants in a drill-seeded system to gain additional growth, without wasting water resources as is done with draining (Rice et al. In spring (April through May), when rice plants have emerged and are being flooded, they fly into rice fields and feed on the upper layer of cells (epidermis) of leaves, producing long, narrow window-like (skeletonized) slits along the leaf called feeding “scars.” Upon reaching host plants, flight muscles of adults degenerate. This method of control reduces or eliminates exposure of susceptible plants to weevil populations but may not compatible with current weed management strategies.

The idea behind this research is that the manure is used to attract detritivores that would further attract predators that could reduce the population of rice water weevil adults in the field (Mercer and Stout 2014). High populations of adults feeding on young rice seedlings just as they emerge through shallow water may kill some seedlings, but such injury is uncommon. Everett A.R.B. Shi "Rice water weevil infesting rice fields - 2009" (video). Weevils prefer ovipositing in the younger tissues of the plant, as seen in experiments with second (ratoon) rice crops (Thompson and Quisenberry 1995). Quisenberry For southern U.S. rice growers that follow a rice–crayfish rotation, there is a recommendation to use neonicotinoids, as pyrethroids are acutely toxic to crayfish (Barbee and Stout 2009). "Rice Water Weevils New Tactics for ManagingThis Insect Pest" Louisisna Agriculture, Summer, 2011. 2012, Lorenz and Hardke 2013, Way and Espino 2014). 2013). That said, it is much more practical to sample the number of adult weevils in the field after flooding. Research into the use of Beauvueria bassiana against rice water weevil began in the early 1990s in California, Louisiana, and Japan. These protein products were expressed several fold higher than in the sexually reproducing weevils, indicating their possible role in parthenogenesis (Jiang et al.

In 4 to 9 days, tiny (1/32 inch), white, slender, legless, C-shaped larvae or grubs hatch from eggs and develop through four stages (instars) for about 27 days until they are about 1/3 inch long. Weevils usually move only a short distance after emerging and often attack nuts on the same trees year after year, so long as there is a crop of nuts. These findings are highlighted in the following sections. H.J. T.R. M.O. Research has shown that applications of these products to only the 30 to 50 feet adjacent to the levees can provide acceptable rice water weevil control in most conditions. The adults inflict minor damage by consuming leaf tissue, leaving typical longitudinal scars along the leaf blade (Stout et al. Rice water weevil pupa and two larvae shown side by side for size comparison. Rice growers in California have traditionally burned fields after harvest to aid in disposable of the rice straw. In California, there is a high level of environmental scrutiny in California given that the aquatic rice agroecosystems are linked to the Sacramento River waterway, providing drinking water to many urban areas, and ultimately to the San Francisco Bay estuary (Hill et al. 2010). The dispersal rate of L. oryzophilus was calculated at 36 km per year along the coast in southwest and northeast directions from foci in Zheijiang province. Weeds are an important food source for weevils before rice planting and help induce flight muscle regeneration and ovariole development. Bond A.A. Oraze 2002a).

Taillon Tugwell Larvae consume the kernel from the inside out, leaving behind an emptied husk. D.R. R. It has been observed that larvae that have established on aquatic weeds will migrate to rice through the submerged soils (Rolston and Rouse 1964). B.J. Williams

This feeding, root pruning, can reduce the number of tillers and may interfere with nutrient uptake by plants. Hesler McClain Oraze

L. oryzophilus fits this common model. Recently Phyllom Bioproducts LLC, a biopesticide company based in the San Francisco area, has been working with a product based on Bacillus thuringiensis spp. The rice weevil (Sitophilus oryzae) is a stored product pest which attacks seeds of several crops, including wheat, rice, and maize.

Because the rice water weevil larvae prune roots and reduce tillering, it is particularly important to have early and effective weed control to maximize recovery from water weevil injury. Roberts

A new sampling method has been developed to aid in decision-making for post-flood insecticide applications. M.L. Research into the biology of rice water weevil diapause has found that mortality in diapausing weevils was almost 100% when temperatures were −20°C in moist soil as opposed to 30.5% mortality in dry soil at the same temperature. Schwardt R. Stout M. Grigarick The method may be biased toward later stage instars, as the small and fragile first and second instars might be destroyed during the process (Wu and Wilson 1997). Way In the southern United States and China, adults will go through additional generations because of the longer growing season and multiple crop cycles (Ingram and Douglas 1930, Chen et al. The applicability of this research is to finding suitable bacteria that can be transformed to cause mortality to overwintering weevil or reduce their fecundity (Lu et al.

It causes yield losses up to 25% in untreated situations (Reay-Jones et al. Before the use of insecticides, cultural controls were the only options available to growers. Oraze Heagler C.M. Male S. orzyae produce an aggregation pheromone called sitophilure ((4S,5R)-5-Hydroxy-4-methylheptan-3-one) to which males and females are drawn. Rice J.A.


T.P. It had one generation per year and its populations peaked on the levees before field flooding, similar to the rice water weevil life cycle (Oraze et al. L.D. Adult feeding can kill plants when large numbers of weevils attack very young rice, but this is rare and is usually localized along the field borders.Damage caused by larva: Most economic damage is caused by larvae feeding in or on rice roots. J. Jiang (grain weevils). These weevils are pests of grain throughout the world. In drill seeded the rice thresholds are based on scars per group of 40 plants. Females lay 2-6 eggs per day and up to 300 over their lifetime. They then pupate within a water-tight, oval mud cell attached to the roots and emerge 5 to 7 days later. N.P.

J.L. D.R. They found overexpression of genes involved with the formation of the mitotic spindle and signal transduction pathways such as beta-1 type tubulin, gephryin, and nucleolar GTP binding protein. Oraze 2006, Reay-Jones et al. In 1964, Grigarick and Beards (1965) corrected that assumption by observing that the eggs are oviposited directly into the sheath tissue. 2009).The Jasmonic acid pathway that regulates wound response (Bari and Jones 2009) could be upregulating strigolactones in response to weevil attack, but this is speculation at this point.


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