No oviposition plasticity in Sitophilus oryzae (L.) (Coleoptera: Curculionidae)

Povey, S. R.; Sibly, Richard M.

doi:10.1016/0022-474x(92)90026-m

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…This procedure simulates culture conditions in which the culture interval is 8 weeks, taking into consideration that mating in S. zeamais does not occur before weevils are 3 d old (Walgenbach and Burkholder, 1987). There was little possibility of third generation adults emerging since the minimum time needed for development is 28 d (Povey and Sibly, 1992). The weevils emerging from each jar were counted to give a measure of productivity.…”

Section: Progeny Productionmentioning

confidence: 99%

The impact of grain quantity on the biology of Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae): oviposition, distribution of eggs, adult emergence, body weight and sex ratio

Danho

Gaspar

Haubruge

2002

Journal of Stored Products Research

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Studies were conducted to observe the effect of grain quantity on the oviposition, distribution of eggs, adult emergence, adult body weight and sex ratio of Sitophilus zeamais, an important pest of maize. Three quantities of maize grains (200, 400 and 800 grains/glass jar of 1 l) were used under laboratory conditions (301C and 70% r.h.). Twenty five male/female pairs of maize weevil were introduced into each glass jar for 12 d. The greatest and lowest number of eggs was laid on batches of 800 and 200 grain kernels, respectively. The total number of grains attacked followed a similar trend. The aggregation of eggs expressed as a ratio of the variance to mean increased as the amount of maize grains was increased. The aggregation parameter k ranged from 2.35 on 200 grains to 4.49 on 800 grains. On average, a significantly higher proportion of grains were infested (90%) when less grain was present. Emergence of adult weevils was, however, maximal (472 individuals/glass jar) when the grain quantity was highest. The mean weight of the emerged adults was not significantly influenced by grain quantity, but female weevils were heavier than males (mean weight 3.16 vs. 3.05 mg) irrespective of maize quantity and eggs laid. Sex ratio (males/100 females) of emerged adults did not differ among treatments. The importance of grain quantity, and of oviposition, in internally feeding granivores and the possibility that there is an adaptive reproductive strategy are discussed. r 2002 Elsevier Science Ltd. All rights reserved.

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Section: Progeny Productionmentioning

confidence: 99%

The impact of grain quantity on the biology of Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae): oviposition, distribution of eggs, adult emergence, body weight and sex ratio

Danho

Gaspar

Haubruge

2002

Journal of Stored Products Research

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“…1). The low numbers of S. zeamais was due to the fact that after the initial infestation a minimum of 28 days are needed for eggs laid to develop into adults (Povey and Silby, 1992). Subsequently, relatively larger numbers were recorded for all the portions, with the middle portion recording the largest population increase at the end of the storage period whilst the bottom portion recorded the least number of weevils (Table 1).…”

Section: Results and Discussion Number Of Weevilsmentioning

confidence: 99%

“…The weevils thus Levels of infestation on three different portions of the maize cob... 23 moved away from the tip to other portions of the cob. The problems associated with the successful control of this pest are compounded by the relatively short life cycle of the pest (Povey and Silby, 1992). Infestation of maize by weevils is not restricted to the field, but storage facilities not protected from insect pest attack can also be a source of infestation.…”

Section: Results and Discussion Number Of Weevilsmentioning

confidence: 99%

Levels of infestation on three different portions of the maize cob by the weevil <i>Sitophilus zeamais</i> (motschulsky)

Baidoo¹,

Mochiah²,

Akyaw³

2011

Jnl Sci Tech

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The maize weevil, Sitophilus zeamais is a major storage pest of maize that causes significant quantitative and qualitative losses to the farmer. The extent of damage caused by S. zeamais to stored maize depends on the initial level of infestation on the field before harvest. The levels of infestations on three different portions of maize cob were studied. Maize was planted during the minor planting season (September-December) of 2008. Maize seeds were sown on 9 plots each measuring 7.0 m x 1.5 m. Matured maize cobs were harvested 110 days after emergence. Ten cobs were randomly selected from each of the plots, dehusked and cut into three portions: top, middle and bottom and stored separately in sealed plastic containers for 5 weeks. Weevils were counted weekly during the storage period. Percent damaged seeds and numbers of holes on damaged grains were counted for each portion. Percent weight loss due to S. zeamais infestation was calculated for the different maize portions. Weevil infestations were recorded on all the portions 1 week after storage. Large numbers of S. zeamais were recorded on all the portions at the end of the storage period. The middle portion recorded significantly more S. zeamais than the top and bottom portions. Percent damaged seeds; percent weight loss and mean number of holes on damaged seeds did not differ significantly.

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“…Alors que les pontes multiples ont longtemps été considérées comme un comportement inadapté (Holloway 1984;Povey et Sibly 1992;Smith et Lessells 1985), ce n'est que récemment que la valeur adaptative de ce comportement a été reconnue (Parker et Courtney 1984;van Alphen et Visser 1990). Selon ces auteurs, les pontes multiples sont favorisées lorsque les bénéfices en terme de «fitness» liés à l'addition d'un oeuf sont profitables uniquement à ce dernier oeuf.…”

Section: Discussionunclassified

Comportement de ponte et stratégie reproductive de Sitophilus zeamais [Coleoptera : Curculionidae]

Danho

Haubruge

2004

phyto

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Des couples vierges de Sitophilus zeamais ont été placés dans des boîtes de Pétri contenant 8, 16 ou 32 grains de maïs. Après 10 jours d’infestation, nous avons dénombré les oeufs pondus, le nombre de grains infestés et la fréquence de distribution des oeufs par grain. Les grains ont ensuite été laissés en incubation pendant 7 semaines avant d’observer l’émergence des adultes et déterminer leur poids moyen et le sexe-ratio. Les résultats de la distribution des oeufs sur les grains de maïs indiquent que la ponte se fait de manière agrégative. Il n’existe pas de différence au niveau du nombre moyen d’oeufs pondus dans chaque traitement (avec une moyenne de 43, 39 et 36 oeufs pour les densités de 32, 16 et 8 grains/Pétri respectivement). Par contre, en ce qui concerne l’émergence des adultes, le plus grand nombre d’individus provient des lots contenant le plus grand nombre de grains. Il existe également des différences significatives au niveau du poids moyen des adultes issus des lots exposés à 32 grains (3,6 mg) qui sont plus lourds que ceux issus des lots contenant 8 grains de maïs (3,4 mg). Par contre, le sexe-ratio des charançons émergés ne diffère pas d’un lot de grains à un autre, et ce, pour les trois traitements. L’importance quantitative des ressources alimentaires sur le comportement de ponte et la biologie des insectes à cycle de développement endogé et la possibilité de l’existence d’une stratégie reproductive sont discutées.Virgin male/female pairs of Sitophilus zeamais were placed in Petri dishes containing 8, 16 or 32 maize grains for 10 days. After this period, the adults were removed and records were made as follow: number of eggs laid, number of grains infested and frequency distribution of egg number per grain. The grains were kept for 7 weeks after which the emerged adults were sieved off and counted. The sex ratio and weight were determined. Results indicated that S. zeamais tends to cluster eggs on the grains. There was no significant difference between the number of eggs recorded in each treatment (with an average of 43, 39 and 36 eggs for the quantities of 32, 16 and 8 grains per dish respectively). However, more adults emerged from the high density treatment. Average weight of adults emerged from batches exposed to 32 grains (3.6 mg) was also significantly higher than that resulting from batches containing 8 grains (3.4 mg). Sex ratios of emerged adults did not differ among treatments. The impact of grain quantity on biology and oviposition, in internally feeding granivore insects and the possibility that there is an adaptive reproductive strategy are discussed

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No oviposition plasticity in Sitophilus oryzae (L.) (Coleoptera: Curculionidae)

Cited by 6 publications

References 7 publications

The impact of grain quantity on the biology of Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae): oviposition, distribution of eggs, adult emergence, body weight and sex ratio

The impact of grain quantity on the biology of Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae): oviposition, distribution of eggs, adult emergence, body weight and sex ratio

Levels of infestation on three different portions of the maize cob by the weevil <i>Sitophilus zeamais</i> (motschulsky)

Comportement de ponte et stratégie reproductive de Sitophilus zeamais [Coleoptera : Curculionidae]

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