THE BIOLOGY OF THE LESSER CLOVER LEAF WEEVIL, <i>HYPERA NIGRIROSTRIS</i> (FABR.) (COLEOPTERA: CURCULIONIDAE), ON RED CLOVER, <i>TRIFOLIUM PRATENSE</i> L., IN SASKATCHEWAN

Weiss, R.M.; Gillott, Cedric

doi:10.4039/ent125831-5

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…A duração mínima deste ínstar foi de dois dias e a máxima de oito dias e a maior freqüência de eclosão ocorreu no quinto dia após a oviposição (Figura 2). A duração média de cinco dias no primeiro ínstar larval, obtida com S. rufus, é semelhante à observada em outros curculionídeos (8,28).…”

Section: Resultados E Discussão Descrição Duração E Viabilidade Das unclassified

FASE LARVAL DE Spermologus rufus BOHEMAN (COLEOPTERA: CURCULIONIDAE)

Barreto¹,

Anjos²

2000

RSA

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sob condições controladas (t = 24,9+0,9 o C; UR = 78,5+5,9%). Neste trabalho procurou-se caracterizar a fase larval da espécie Spermologus rufus e obter conhecimentos do comportamento do inseto, visando ao seu controle. Realizou-se a descrição morfológica, determinou-se a quantidade, a duração e a viabilidade dos ínstares larvais e estudou-se o comportamento alimentar e de defesa. No estudo da morfologia verificou-se que, ao eclodirem, as larvas mostravam formato subcilíndrico, pouco encurvadas e de coloração bege-clara. De acordo com os valores das larguras das cápsulas cefálicas, pode-se inferir que as larvas de S. rufus apresentaram três ínstares larvais. O período larval variou de 3 a 24 dias, sendo as larvas encontradas na porção interna da semente. Após a eclosão, elas permaneceram nesse mesmo local alimentandose do endosperma, até se transformarem em adultos. As larvas apresentaram fototaxia negativa.Palavras-chave: inseto, curculionidae, morfologia, ínstar, Araucaria angustifolia. ABSTRACTWorks were held at Viçosa Federal University Forest Entomology laboratory, in Viçosa, MG, under controlled conditions. In this survey, larval phase of Spermologus rufus was characterized, aiming at obtaining useful knowledge to control of this insect. Quantity of larval instars, morphology description, duration and viability of instars larval, and behavior of feeding and defense were determined. It was observed in the morphologic study that after their eclosion, larvae were subcilindrical, little incurvated and with light bege colour. According to the values found, S. rufus larvae present three larval instars. Larval period varied from three to 24 days. The larvae were found in the internal seed portion. After eclosion, the remained in this same place, while feeding the endosperm until changed in adults. The larvae showed negative phototaxis.

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Section: Resultados E Discussão Descrição Duração E Viabilidade Das unclassified

FASE LARVAL DE Spermologus rufus BOHEMAN (COLEOPTERA: CURCULIONIDAE)

Barreto¹,

Anjos²

2000

RSA

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“…The two most important insect pests are the white clover seed weevil, Apion fulvipes Geoff (Coleoptera: Cucurlionidae), and the lesser clover leaf weevil, Hypera nigrirostris Fabr (Coleoptera: Cucurlionidae). Feeding by these two pests can reduce the seed yield by more than 0·50 (Weiss and Gillot, 1993; Hansen, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Both larvae and adults can cause damage. After hatching, the larvae migrate to the axils between two stipules and then to the flower‐head or stem (Weiss and Gillot, 1993). Larval movement is limited to moving from one feeding place to the next, where they eat both seeds and the green part of the plant, and in many cases the clover shoot is completely destroyed (Markkula and Tinnilä, 1956).…”

Section: Introductionmentioning

confidence: 99%

Thresholds of economic damage by clover seed weevil (Apion fulvipes Geoff.) and lesser clover leaf weevil (Hypera nigrirostris Fab.) on white clover (Trifolium repens L.) seed crops

Hansen

Boelt

2008

Grass and Forage Science

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Thresholds of economic damage by clover seed weevil (Apion fulvipes Geoff.) and lesser clover leaf weevil (Hypera nigrirostris Fab.) on white clover (Trifolium repens L.) seed crops Abstract Severe reductions in the seed yield of white clover can occur because of feeding by the white clover seed weevil Apion fulvipes and the lesser clover leaf weevil Hypera nigrirostris which together can reduce the seed yield by more than 0AE50. From 2002 to 2006 five field experiments were carried out to investigate the relationship between the density of these two weevil species and seed yield of white clover. Damage caused by the weevils was calculated as the difference in the number of weevils and the difference in seed yield between the average of insecticide-treated and untreated plots. Loss of seed yield was expressed as a proportion of the seed yield in insecticide-treated plots, which allowed for a comparison between years as yields in insecticide-treated plots varied. A multiple regression approach was chosen in which proportional loss in seed yield was the response variable and the weevils A. fulvipes and H. nigrirostris were the independent variables. Data obtained from the experiments were used to construct the following threshold model of economic damage: Proportion of yield loss ¼ 0Á127 Â log No. Apion per flower-head þ 1 ð Þ þ 0Á134 Â No. Hypera per flower-head:

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Assessing chemical control options and their effects on the lesser clover leaf weevil (Hypera nigrirostris) and red clover pollinators in Western Canada

2021

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THE BIOLOGY OF THE LESSER CLOVER LEAF WEEVIL, HYPERA NIGRIROSTRIS (FABR.) (COLEOPTERA: CURCULIONIDAE), ON RED CLOVER, TRIFOLIUM PRATENSE L., IN SASKATCHEWAN

Abstract: The Canadian Entomologist 125: 831-837 (1993) Populations of the lesser clover leaf weevil, Hypera nigrirostris (Fabr.), on red clover, Trifolium pratense L.

Cited by 5 publications

References 6 publications

FASE LARVAL DE Spermologus rufus BOHEMAN (COLEOPTERA: CURCULIONIDAE)

FASE LARVAL DE Spermologus rufus BOHEMAN (COLEOPTERA: CURCULIONIDAE)

Thresholds of economic damage by clover seed weevil (Apion fulvipes Geoff.) and lesser clover leaf weevil (Hypera nigrirostris Fab.) on white clover (Trifolium repens L.) seed crops

Assessing chemical control options and their effects on the lesser clover leaf weevil (Hypera nigrirostris) and red clover pollinators in Western Canada

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