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RELATIONSHIPS AMONG PHEROMONE TRAP CATCHES OF MALE CORN EARWORM MOTHS (LEPIDOPTERA: NOCTUIDAE), EGG NUMBERS, AND PHENOLOGY IN CORN1

Published online by Cambridge University Press:  31 May 2012

M.A. Latheef ,
J.A. Witz  and
J.D. Lopez Jr.
M.A. Latheef
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Pest Control Research Unit, College Station, Texas, USA 77843
J.A. Witz
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Pest Control Research Unit, College Station, Texas, USA 77843
J.D. Lopez Jr.
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Pest Control Research Unit, College Station, Texas, USA 77843
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Abstract

Relationships among catches of corn earworm moths, Helicoverpa (= Heliothis) zea (Boddie), in pheromone traps, numbers of corn earworm eggs, and corn ears with fresh silks were investigated in eight corn fields during a 2-year period in Brazos River Valley, Texas. Cross-correlation analysis indicated that the catches of corn earworm moths in pheromone traps were closely associated with egg numbers in seven of eight fields with a time differential varying between −1 to +2 days. Cross-correlation peaks for new silks versus eggs occurred with time differentials being mostly positive, indicating that corn earworm egg numbers reached a maximum after corn produced large numbers of fresh silks on ears.

There was a weak but significant linear relationship between egg numbers and corn earworm catches in pheromone traps when corn was in the whorl stage of growth. A stepwise regression model of the form: log (eggs/ha + 1) = 3.71 + 0.22*log(S + 1)*log(T + 1) − 0.3*log(S + 1), where S = numbers of corn ears with new silks per hectare, and T = mean corn earworm moths per trap, explained 52.5% of the variance. These results emphasize the mediating effects of fresh silks on corn earworm oviposition on corn.

Résumé

Les rapports parmi les prises d’adultes du ver d’épis du maïs, Helicoverpa (= Heliothis) zea (Boddie), aux pièges de phéromones, le nombre d’oeufs du ver d’épis du maïs, et les épis de maïs aux soies fraîches ont été étudiés dans huit champs de maïs pendant une période de 2 ans au Brazos River Valley, Texas. L’analyse de corrélation de croisement a signalé que les prises d’adultes du ver d’épis de maïs aux pièges de phéromones ont été fortement reliées au nombre d’oeufs dans sept des huit champs, avec une différence temporale variant entre −1 à +2 jours. Les apogées de corrélation de croisement entre les soies fraîches et les oeufs ont eu lieu avec les différences temporales étant, pour la plupart, positives, ce qui a démontré que le nombre d’oeufs du vers d’épis du maïs a atteint un maximum après la production d’une profusion de soies fraîches aux épis.

Un faible mais significatif rapport linéaire a existé entre le nombre d’oeufs et les prises des pièges de phéromones quand le maïs a été dans le stade de croissance du verticille. Un modèle de régression par échelonnement de la forme : log (oeufs/ha + 1) = 3,71 + 0,22*log(S + 1)*log(T + 1) − 0,3*log(S +1), quand S = le nombre d’épis aux soies nouvelles par hectare, et T = la moyenne des adultes du vers d’épis du maïs par piège, ont expliqué 52,5% de variance. Les présents résultats font sortir les effets médiateurs des soies fraîches sur la ponte du ver d’épis du maïs sur le maïs.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 2 , April 1991 , pp. 271 - 281
Copyright
Copyright © Entomological Society of Canada 1991

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