Laboratory studies on protectants for control of Coleoptera in maize

Samson, Peter R.; Parker, R.J.

doi:10.1016/0022-474x(89)90008-8

Cited by 28 publications

(6 citation statements)

References 12 publications

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“…This situation is opposed to that observed in S. zeamais, where only a slight resistance to chlorpyrifos methyl was found until recently (Ribeiro et al 2003). Similar results were obtained by Samson & Parker (1989) and Vásquez-Castro (2006), who recorded better control of S. zeamais than of S. oryzae when organophosphorus insecticides were used. Although esfenvalerate has never been used against the populations under study, it was less toxic than fenitrothion.…”

Section: Methodssupporting

confidence: 36%

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Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Vásquez-Castro¹,

Baptista²,

Trevizan³

et al. 2009

Neotrop. entomol.

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-Insect-pest mobility can infl uence insect susceptibility to the insecticides used to control them. The objective of this work was to evaluate the fl ight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch populations reared on corn and wheat grains, and its relationship with insecticide susceptibility. Unsexed adult insects with ages between 10 and 20 days were placed on a plastic tray. A 40-watt incandescent light bulb was positioned at a 50 cm height relative to the tray. Flight activity was evaluated during 30 min. In the LC 50 estimation bioassays, the insects were exposed to dry residues of the organophosphorus insecticide fenitrothion and of the pyrethroid insecticide esfenvalerate on the internal surface of glass vials. Mortality was evaluated 24h after installation of the experiments. Sitophilus zeamais showed greater fl ight activity when compared with S. oryzae; likewise, insects reared on corn had greater fl ight activity than those reared on wheat. Sitophilus oryzae was less susceptible to the insecticides studied than S. zeamais. Adults reared on wheat were more susceptible to the insecticides than those reared on corn. This study demonstrates that the lower fl ight activity of S. oryzae is related to its greater tolerance to insecticides.

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Section: Methodssupporting

confidence: 36%

“…In this respect, greater tolerance of S. oryzae to organophosphorus compounds (Samson & Parker 1989) and greater genetic variability of S. zeamais (Grenier et al 1994) have been reported. Although several studies have demonstrated a high effectiveness of organophosphorus compounds to control Sitophilus spp.…”

Section: Methodsmentioning

confidence: 99%

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Vásquez-Castro¹,

Baptista²,

Trevizan³

et al. 2009

Neotrop. entomol.

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“…Previous research with pyrethroids produced mixed results; resmethrin and bioresmethrin application rates of at least 5 ppm were necessary to give residual control of rice weevils and maize weevils for 6 mo (Arthur 1992), whereas application rates of 1Ð2 ppm of deltamethrin and cyßuthrin did give residual control (Arthur 1994a(Arthur , 1994b. Also, application rates of pyrethroids needed to kill the lesser grain borer, Rhyzopertha dominica (F.), which is also an internal beetle pest of stored grain, are generally much lower than those required to kill rice weevils or maize weevils (Bengston et al 1987, Samson andParker 1989;Arthur 1994aArthur , 1994b.…”

Section: Discussionmentioning

confidence: 98%

Efficacy of Ethiprole Applied Alone and in Combination with Conventional Insecticides for Protection of Stored Wheat and Stored Corn

Arthur

2002

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The insecticidal pyrazole ethiprole, applied at rates of 7.5 and 10.0 ppm either alone or in combination treatments with deltamethrin, piperonyl butoxide, and chlorpyrifos-methyl, was evaluated as a protectant of stored wheat and stored corn. The commodities were treated with six treatment combinations, including an untreated control, and held for 6 mo at 22, 27, or 32 degrees C and 57% RH. Bioassays were conducted monthly by exposing the rice weevil, Sitophilus oryzae (L.), and the red flour beetle, Tribolium castaneum (Herbst), on treated wheat and the maize weevil, Sitophilus zeamais (Motschulsky), and the red flour beetle on treated corn. The storage temperature of wheat did not significantly affect mortality of exposed insects (P > or = 0.05). All rice weevils were dead after 1 wk in all treatments, and no F1 adults were produced. Mortality of red flour beetles was not dependent on either chemical treatment or bioassay month, and no F1 adults were produced. The storage temperature of corn did not significantly affect mortality of exposed insects (P > or = 0.05). Mortality of maize weevils varied from 77.9 to 100% in all chemical treatments, and no F1 adults were produced. Mortality of red flour beetles was also variable among treatments and bioassay month and no F1 adults were produced. This is the first published report of a study in which pyrazoles have been evaluated against stored-grain insects.

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“…A study of Athanassiou et al (2004) concluded that deltamethrin and cyfluthrin were more toxic than cypermethrin when used to control S. oryzae, however none of the treatments caused 100% mortality of this species. Many studies compared the responses of Coleopteran pests to bioresmethrin, resmethrin, deltamethrin, showing that R. dominica and T. castaneum were more sensitive to these pyrethroids than S. oryzae (Samson and Parker, 1989, Arthur, 1992, Arthur, 1994.…”

Section: Resistance To Synthetic Pyrethroidsmentioning

confidence: 99%

Genetics of phosphine resistance in the rice weevil Sitophilus oryzae (L.) (Coleoptera: Curculionidae)

Nguyen¹

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The rice weevil, Sitophilus oryzae (Linnaeus) is a cosmopolitan insect pest that can cause severe damage to stored grain with regard to both quality (loss of nutritional and aesthetic value) and quantity (loss of grain weight). Heavy reliance on the fumigant phosphine to disinfest stored products has led to resistance to phosphine in many insect species including S. oryzae. The frequency and level of phosphine resistance in S. oryzae has increased in the last fifty years in Asian and Africa countries and recently in Australia as well. A strongly phosphine resistant strain of S. oryzae was first detected in 2009 in Australia. I have determined the strong resistance trait in this strain to be incompletely recessive, autosomal and controlled by at least two major genes. The weakly resistant Australian strain shares a common resistance factor with the strongly resistant strain (So_rph1), which is responsible for weak resistance. I also compared the resistance trait of the Australian strain to that of collected from Vietnam and China. Complementation analysis revealed a shared genetic mechanism of phosphine resistance between the three strains that I tested.I then identified and sequenced the genes conferring phosphine resistance in this species.This process began with simply sequencing transcripts of the two genes known to be responsible for phosphine resistance in Rhyzopertha dominica and Tribolium castaneum (rph1/tc_rph1 and rph2/tc_rph2). rph2/tc_rph2 had been published and was known to encode the metabolic enzyme, dihydrolipoamide dehydrogenase (DLD). Variants of DLD (So_rph2) also cause strong resistance in S. oryzae when interacting with resistance variants of So_rph1. Therefore, rph2/DLD is responsible for strong resistance in each of the three species. A specific substitution mutation (N505T) in DLD is likely responsible for phosphine resistance as it is found in all strongly resistant strains of S. oryzae from Australia, Vietnam and China. A fitness cost associated with the resistance allele of So_rph2 was observed in the absence of selection in populations derive from the F 1 progeny between a strongly resistant strain and strains lacking a resistance allele at So_rph2.As DLD is one of three subunits (E1, E2, E3) of α-ketoacid dehydrogenase complexes, Ihypothesized that suppression of the activity of subunits other than DLD might also result in resistance to phosphine. Thiamine pyrophosphate is critical cofactor of the E1 subunit and is required by very few other enzymes. I reasoned that insects cultured on a diet of white rice, which is deficient in thiamine, would experience inhibition of the activity of E1. I expected to observe the change in response to phosphine in both the susceptible and ii resistance strains of S. oryzae when fed on white rice diet compared with the thiamine containing diet of whole grain (brown rice or whole wheat). Against my expectation, I found no significant affect of a thiamine deficient diet toward phosphine resistance in S. oryzae.A diet of white rice, however, did ...

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Laboratory studies on protectants for control of Coleoptera in maize

Cited by 28 publications

References 12 publications

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Efficacy of Ethiprole Applied Alone and in Combination with Conventional Insecticides for Protection of Stored Wheat and Stored Corn

Genetics of phosphine resistance in the rice weevil Sitophilus oryzae (L.) (Coleoptera: Curculionidae)

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