Some Humidity and Light Reactions of the Granary Weevil,<i>Sitophilus granarius</i>(L.) (Coleoptera: Curculionidae)

Smereka, E. P.; Hodson, A. C.

doi:10.4039/ent91784-12

Cited by 31 publications

(11 citation statements)

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“…The hygropositive response of the treated insects observed in one of the experiments seems to confirm the above suggestion. Similar behaviour has been shown in other insects especially desiccated individuals of Ptinus tectus (Bently, 1944), Sitophilus granarius (Smereka & Hodson, 1959), Dysdercus intermedius (Youdeowei, 1967) and Tenebrio molitor (Dodds & Ewer, 1952). The probing of the false floor of the experimental chamber with the antennae suggests that some of the hygroreceptors are probably situated on the antennae.…”

Section: Discussionsupporting

confidence: 76%

THE REACTION OF THE KOLA WEEVIL, SOPHRORHINUS GBANJAENSIS TO MOISTURE

Daramola

1976

Entomologia Exp Applicata

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The reaction of the kola weevil, Sophrorhinus gbanjaensis to moisture in a simple and a two‐way gradient (centre low, high at ends) and a humidity choice chamber and its survival at the different relative humidities of 10, 30, 60, 80 and 95% R.H. were investigated. Both the male and female insects showed preference for the dry air (10 & 30% RH) in the humidity gradient irrespective of its position along the gradient. The insects also detected and reacted to humidity differences of 20 & 30% RH when offered a choice of 40–60%; 0–30%; 60–100%; 10–60% and 50–100% relative humidities. The indices of reaction (IR) increased with increase in the differences between the pairs of humidities offered with a peak at 60–100% and 50–100% RH for males and females respectively. The insects survived for an average of 21.1 ± 1.3 days and 5.4 ± 0.2 days at 95% and 10% RH respectively. A highly significant negative correlation (r= −0.926) was obtained between the mortality rates of the insects and the various relative humidities. RÉSUMÉ REACTION DU CHARANÇON DE LA NOIX DE COLA, SOPHRORHINUS GBANJAENSIS A L'HUMIDITE Les réactions du charançon de la noix de cola, Sophrorhinus gbanjaensis, dans des expériences de gradients d'humidité linéaires ou symétriques, ont été étudiées en laboratoire à la température de 26–28°. On a également observé les réponses de l'insecte à des choix entre deux conditions d'humidité différentes, en fonction de l'amplitude des différences proposées et de la position des valeurs de l'H.R. dans la gamme de 10 à 100%. Les effets de la déshydratation et du jeûne sur les réactions des insectes et sur leur survie aux diverses conditions d'humidité relative ont enfin été prises en considérations. Les mâles et femelles montrent une préférence pour les conditions de milieu à faible humidité relative de l'air (10% RH) que ces conditions soient présentées selon un gradient linéaire (de 10% à 100% RH) ou selon un dispositif symétrique (fig. 1 et 2). Cependant les expériences témoins montrent un preferendum pour les sites placés aux extrêmités du dispositif expérimental (fig. 3) ce qui témoigne de l'intervention d'un autre facteur spatial, qui mériterait d'être analysé. Les insectes peuvent déceler des différences d'H.R. de l'ordre de 20 à 30%, et l'indice de reactivité des insectes (IR) croît avec l'amplitude des différences entre les H.R. proposées, le maxima de reactivité se manifestant respectivement pour les zones 60–100% ou 50–100% chez les insectes mâles et les insectes femelles. Les insectes, préalablement soumis à des conditions de déshydration (48h. dans un dessicateur CaCl2) et de jeûne, montrent un fort preferendum pour les zones à forte H.R. (60–100%) du dispositif expérimental. Ce type de réponse, totalement différent de la réaction préférentielle aux basses H.R. telle qu'elle est présentée par les insectes non traités, est ici discuté, sur la base des conditions saisonnières rencontrées par cette espèce au cours de son cycle biologique. Par ailleurs la mortalité des insectes est plus élevée dans les conditi...

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Section: Discussionsupporting

confidence: 76%

THE REACTION OF THE KOLA WEEVIL, SOPHRORHINUS GBANJAENSIS TO MOISTURE

Daramola

1976

Entomologia Exp Applicata

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“…The formula was modified by Bentley (1944) to 100(D-W)/N and was used by Willis and Roth ( 1950) and Smerka and Hodson ( 1959). The formula was modified by Bentley (1944) to 100(D-W)/N and was used by Willis and Roth ( 1950) and Smerka and Hodson ( 1959).…”

Section: Discussionmentioning

confidence: 99%

A Classification of the Genera and Higher Taxa of the Meloid Subfamily Eleticinae (Coleoptera)

Selander

1966

Can Entomol

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The Eleticinae are an archaic and in many respects primitive group of Meloidae found in South America (widespread), Africa (south of the Sahara Desert), and the Oriental Region (India to Thailand). They are, in general, poorly represented in collections, and very little is known definitely of their bionomics. On the basis of an analysis of adult anatomical characters the subfamily is defined in detail and is classified to the generic level in the present paper. Two tribes, seven subtribes, and 10 genera are recognized, keyed, and diagnosed. The tribe Spasticini is arranged as follows: Protomeloina Abdullah, transferred from the Meloinae and reduced to subtribal rank, with Protomeloe Abdullah; Spasticina Kaszab with Spastica Lacordaire; Xenospastina, new subtribe, with Xenospasta, new genus; and Anthicoxenina, new subtribe, with Anthicoxenus Fairmaire and Germain, formerly placed in the Anthicidae, and Iselma Haag-Rutenberg. The arrangement of the tribe Eleticini is: Eospastina, new subtribe, with Eospasta, new genus, and Serrospasta, new genus; Eleticina Wellman with Eletica Lacordaire (and including, as subgenera, Sibuteletica Pic, Meteletica Kaszab, and Proeletica Kaszab); and Ertlianina, new name for Ertliini Kaszab, with Ertliana Selander (= Steniselma Borchmann, new synonymy) and Ceriselma Borchmann, the latter elevated from subgeneric rank in Iselma. Species described as new are Protomeloe simplex (Argentina), Spastica minas (Brazil), Xenospasta flava (Colombia), and Serrospasta vittata (Colombia).

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“…Likewise, the rate of development of Plodia interpunctella, Cadra cautella, C. calidella and Ephestia elutella was adversely influenced at atmospheric moisture below 40, 25, 30 and 30 %, respectively (BURGES et al 1960;HARUKAWA et al 1936;HOWE 1953). The effectiveness of RH on behaviour of storage insect pest have also been demonstrated, among others, by BARLOW et al (1966), PERTTUNEN (1972) and SMEREKA et al (1959).…”

Section: Introductionmentioning

confidence: 95%

Effect of relative humidity on adults of 10 different species of stored product beetles

Khan

1983

Zeitschrift für Angewandte Entomologie

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The desiccation resistance of adult insects of the following 10 stored product insect species was investigated at 25 °C under starvation conditions at different stages of relative humidity (0, 35, 65, 80, 95 and 100 % RH): Lasioderma serricorne; Oryzaephilus mercator; O. surinamensis; Rhizopertha dominica; Sitophilus granarius; S. zeamais; Stegobium paniceum; Tenehroides mauritanicus; Triholium castaneum, T. confusum. The suitable range of relative humidity, where the test insects revealed the longest survival period, was about 0 to 97 % for Rh. dominica, 35 to 95 % for L. serricorne, 37 to 96 % for St. paniceum, 50 to 100 % for O. mercator, 50 to 97 % for T. confusum, 50 to 95 % for O. surinamensis, 60 to 98 % for T. castaneum, 60 to 90 % for Ten. mauritanicus, 95 to 100 % for S. granarius and nearly 100 % for S. zeamais ‐ the last insect proved to be the most hygrophile. The former 7 species might be called as euryhygrous, that is, tolerant to a broad range of atmospheric moisture; both the latter species (S. zeamais and S. granarius), however, were stenohygrous. Moreover, these two species proved to be the most susceptible to dryness of all the species tested; they were, on the other hand, the most hygrophile of all the insects tested. The favourable range of atmospheric moisture was broadest for Rh. dominica and narrowest for S. zeamais. The latter species revealed the highest (37.4 days at nearly 100 % RH) average survival period of all the species investigated. The longest survival period of an individual of S. zeamais and T. castaneum was 82 days at 100 % and 80 days at 95 % RH, respectively. Zusammenfassung Einfluβ der Luftfeuchte auf adulte Tiere von 10 verschiedenen Arten vorratsschädlicher Käfer Die Widerstandsfähigkeit adulter Tiere von 10 vorratsschädlichen Insektenarten gegen Austrocknung wurde bei unterschiedlicher Luftfeuchte ‐ 0, 35, 65, 80, 95 und 100 % ‐ unter Hungerbedingungen bei 25 °C untersucht: Lasioderma serricorne; Oryzaephilus mercator; O. surinamensis; Rizopertha dominica; Sitophilus granarius; S. zeamais; Stegobium paniceum; Tenebroides mauritanicus; Tribolium castaneum und T. confusum. Der Luftfeuchte‐Bereich, in dem die Versuchstiere am längsten lebten, war ca. 0 bis 97 % für Rh. dominica; 35 bis 95 % für L. serricorne; 37 bis 96 % für St. paniceum; 50 bis 100 % für O. mercator; 50 bis 97 % für T. confusum; 50 bis 95 % für O. surinamensis; 60 bis 98 % für T castaneum; 60 bis 90 % für Ten. mauritanicus; 95 bis 100 % für S. granarius und fast 100 % für S. zeamais ‐ die letzte Art erwies sich als am stärksten hygrophil Die erstgenannten 7 Arten sind euryhygr, d. h. widerstandsfähig in weiten Bereichen der Umweltfeuchte. Die beiden letztgenannten Arten (S. zeamais und S. granarius) jedoch sind als stenohygr zu bezeichnen. Außerdem zeigen diese beiden Arten von allen untersuchten Schädlingsarten die höchste Empfindlichkeit gegenüber Trockenheit. Der optimale Bereich der Umweltfeuchte war am weitesten für Rh. dominica und am engsten für S. zeamais. S. zeamais hatte im optimalen L...

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Some Humidity and Light Reactions of the Granary Weevil,Sitophilus granarius(L.) (Coleoptera: Curculionidae)

Cited by 31 publications

References 13 publications

THE REACTION OF THE KOLA WEEVIL, SOPHRORHINUS GBANJAENSIS TO MOISTURE

THE REACTION OF THE KOLA WEEVIL, SOPHRORHINUS GBANJAENSIS TO MOISTURE

A Classification of the Genera and Higher Taxa of the Meloid Subfamily Eleticinae (Coleoptera)

Effect of relative humidity on adults of 10 different species of stored product beetles

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