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Biology of the Chalcid Wasp, Megastimus wachtli , and Its Relationship to Colonization of Cypress Seeds by the Tortricid Moth, Pseudococcyx tessulatana , in Algeria

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ABSTRACT

The biology of Megastimus wachtli Seitner (Hymenoptera: Torymidae) was found to be similar to other species of Megastigmus. During the period of flight that lasted six weeks from the beginning of September to mid-October, M. wachtli laid eggs in cypress (Cupressus sempervirens L., Pinales: Cupressaceae) cones and showed preferences for oviposition on particular sites on cones. M. wachtli has a high potential for colonization because it has evolutionary advantages due to its developmental possibilities including its capacity for parthenogenesis, its fecundity and longevity. It generally did not attack cones colonized by the torticid moth, Pseudococcyx tessulatana (Lepidoptera: Tortricidae). The competition between these species for use of cypress cones suggests that they use different strategies for different species of cypress. The number of insects that could develop relative to the number of cones available also varies between species of cypress.

No MeSH data available.


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Distribution of the emergence holes of Megastigmus wachtli according to the degree of damage of the cones of Cupressus sempervirens. A: 1 to 9 emergence holes by cone. B: more than 10 emergence holes by cone. Drawn according to Camus (1914).
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f07: Distribution of the emergence holes of Megastigmus wachtli according to the degree of damage of the cones of Cupressus sempervirens. A: 1 to 9 emergence holes by cone. B: more than 10 emergence holes by cone. Drawn according to Camus (1914).

Mentions: The distribution of the emergence holes of M. wachtli on the colonized cones is illustrated in Figure 7. This distribution reflects the distribution of the insects inside the cone since larvae are unable to move to different parts of a cone.


Biology of the Chalcid Wasp, Megastimus wachtli , and Its Relationship to Colonization of Cypress Seeds by the Tortricid Moth, Pseudococcyx tessulatana , in Algeria
Distribution of the emergence holes of Megastigmus wachtli according to the degree of damage of the cones of Cupressus sempervirens. A: 1 to 9 emergence holes by cone. B: more than 10 emergence holes by cone. Drawn according to Camus (1914).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2990338&req=5

f07: Distribution of the emergence holes of Megastigmus wachtli according to the degree of damage of the cones of Cupressus sempervirens. A: 1 to 9 emergence holes by cone. B: more than 10 emergence holes by cone. Drawn according to Camus (1914).
Mentions: The distribution of the emergence holes of M. wachtli on the colonized cones is illustrated in Figure 7. This distribution reflects the distribution of the insects inside the cone since larvae are unable to move to different parts of a cone.

View Article: PubMed Central

ABSTRACT

The biology of Megastimus wachtli Seitner (Hymenoptera: Torymidae) was found to be similar to other species of Megastigmus. During the period of flight that lasted six weeks from the beginning of September to mid-October, M. wachtli laid eggs in cypress (Cupressus sempervirens L., Pinales: Cupressaceae) cones and showed preferences for oviposition on particular sites on cones. M. wachtli has a high potential for colonization because it has evolutionary advantages due to its developmental possibilities including its capacity for parthenogenesis, its fecundity and longevity. It generally did not attack cones colonized by the torticid moth, Pseudococcyx tessulatana (Lepidoptera: Tortricidae). The competition between these species for use of cypress cones suggests that they use different strategies for different species of cypress. The number of insects that could develop relative to the number of cones available also varies between species of cypress.

No MeSH data available.


Related in: MedlinePlus