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MATING BETWEEN DIAPAUSING AND NONDIAPAUSING STRAINS OF THE CITRUS RED MITE, PANONYCHUS CITRI (MCGREGOR)

Published online by Cambridge University Press:  31 May 2012

Akio Takafuji
Akio Takafuji*
Affiliation:
Entomological Laboratory, College of Agriculture, Kyoto University, Kyoto 606, Japan
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Abstract

The reproductive compatibility between diapausing (DP) and nondiapausing (C) strains of the citrus red mite, Panonychus citri (M.), was determined by crossing experiments. Mating between the two strains was unrestricted, but copulation between C females and DP males was often broken off prematurely, whereas copulation in the reciprocal cross was of normal duration. Diapausing males showed a strong preference for guarding quiescent female deutonymphs of their strain prior to copulation, whereas C males did not. However, males of either strain showed no preference between adult females, resulting in only a partial, one-sided premating isolation between strains. No adult females were produced in the progeny from either interstrain cross, showing reproductive incompatibility is complete. Hatchability of the eggs from the cross between DP females and C males was significantly lower than that from the cross between C females and DP males, or from the intrastrain crosses, suggesting that even though some of the eggs in the former cross were fertilized, they died during embryonic stages. This possibility was supported by the observation that, for DP females mated with a C male, the second intrastrain mating was almost totally ineffective. Also, for C females mated with a DP male, a second intrastrain mating was often ineffective, but to a lesser extent than for DP females. When the two strains coexisted, effective mating was severely curtailed for both strains. The results explained the low proportion of females from overwintered DP eggs in a pear orchard in which the two strains coexisted the previous autumn.

Résumé

Lors d'expériences de compatibilité reproductrice, les souches diapausante et non-diapausante de la mite Panonychus citri (M.) se sont accouplées promptement, mais la copulation entre femelles non-diapausantes et mâles diapausants cessait souvent prématurément. Les mâles diapausants ont montré une préférence marquée pour la garde de deutonymphes femelles quiescentes de leur propre souche avant la copulation, mais ceux d'aucune souche n'ont montré de préférence pour les femelles adultes de l'une ou l'autre souche. Le résultat est une isolation pré-accouplement partielle entre les deux souches. Aucune femelle adulte n'a été obtenue de la progéniture issue de croisements réciproques; les souches sont donc reproductivement incompatibles. La viabilité d'oeufs issus du croisement de femelles diapausantes avec des mâles non-diapausants était significativement plus faible que dans le cas du croisement réciproque ou de l'accouplement intra-souche. Les oeufs non-viables étaient probablement fertilisés, mais mouraient au cours de l'embryogenèse. Cette possibilité est appuyée par l'observation de l'inefficacité presque totale d'un second accouplement intra-souche, dans le cas d'oeufs issus de femelles diapausantes croisées avec des mâles non-diapausants. Ceci s'applique aussi, bien qu'à un degré moindre, dans le cas de croisements réciproques. L'efficacité de l'accouplement était fortement réduite lorsque les deux souches étaient en présence l'une de l'autre. Les résultats ont permis d'expliquer la faible proportion de femelles obtenue d'oeufs d'hivernement dans un verger de poiriers où les deux souches coexistaient l'automne précédent.

Type
Research Article
Information
The Memoirs of the Entomological Society of Canada , Volume 120 , Supplement S146 , 1988 , pp. 181 - 189
Copyright
Copyright © Entomological Society of Canada 1988

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