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BIONOMICS OF PLATYLYGUS LURIDUS (HEMIPTERA: MIRIDAE) IN WISCONSIN JACK PINE SEED ORCHARDS

Published online by Cambridge University Press:  31 May 2012

Aunu Rauf ,
D. M. Benjamin  and
R. A. Cecich
Aunu Rauf
Affiliation:
Fakultas Pertanian, Institut Pertanian Bogor (IPB), Bogor, Indonesia.
D. M. Benjamin
Affiliation:
Department of Entomology, University of Wisconsin-Madison, Wisconsin 53706.
R. A. Cecich
Affiliation:
North Central Forest Experiment Station, Forestry Sciences Laboratory, Rhinelander, Wisconsin 54501.
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Abstract

Platylygus luridus (Reuter) causes conelet abortion and reduces seed production in jack pine, Pinus banksiana Lamb., seed orchards in northern Wisconsin. One generation a year occurs and the insect overwinters as an egg that hatches during late May. The nymphs pass through 5 instars within 5 to 6 weeks. Adults were abundant during July and early August 1982. Eggs were laid singly within the phloem tissues of current year's shoots just below the bases of needle fascicles. The nymphs fed predominantly on the tender tissues of shoots or needles. The adults preferred to feed on ovules in the conelets, and conelet abortion resulted. About 74% of the total abortion occurred during adult feeding periods. Conditions favoring P. luridus population increases in the jack pine seed orchards included: densely planted seed orchards on high fertility sites; trees 6 to 10 years old with closed crowns or in shade; vigorously growing trees that were well watered and fertilized. Natural enemies included predators Deraeocoris albigulus, D. (possibly) laricicola, Evarcha nr. hoyi, and Misumenops asperatus.

Résumé

Le Platylygus luridus (Reuter) a causé l'avortement des cônelets et réduit la production de graines dans des pépinières du pin gris, Pinus banksiana Lamb. situées au nord du Wisconsin. On a observé une génération par an et l'insecte hiverne sous forme d'oeufs qui éclosent tard en mai. Les larves passent par 5 stades durant de 5 à 6 semaines. Les adultes étaient abondants au cours de juillet et au début d'août 1982. Les oeufs sont déposés isolément dans les tissus du phloème des pousses de l'année, juste sous la base des faisceaux d'aiguilles. Les larves se nourrissent principalement à partir des tissus tendres des pousses ou des aiguilles. Les adultes préfèrent s'alimenter à partir des ovules dans les cônelets, causant l'avortement des cônelets. Environ 74% des avortements se sont produits durant les périodes d'alimentation des adultes. Les conditions favorisant la croissance des populations du P. luridus dans les pépinières de pin gris étaient entre autres : une densité de plantules élevée sur des sols fertiles; des arbres de 6–10 ans dont la couronne était fermée où à l'ombre; des arbres vigoureux bien irrigués et fertilisés. Les ennemis naturels étaient entre autres les prédateurs Deraeocoris albigulus, D. (peut-être) laricicola, Evarcha nr. hoyi et Misumenops asperatus.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 9 , September 1984 , pp. 1219 - 1225
Copyright
Copyright © Entomological Society of Canada 1984

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