Author: Amelia C. ZoerbPublisher:
ISBN:
Category :
Languages : en
Pages : 64
Book Description
Effect of Event 176 Bt Corn on Survival and Development of Second Generation European Corn Borer Larvae Ostrinia Nubilalis (Hübner)(lepidoptera: Crambidae)
Author: Amelia C. ZoerbEntomologia Experimentalis Et Applicata
Author: The Effects of the Second Generation European Corn Borer, Ostrinia Nubilalis (Hubner) (Lepidoptera
Author: P.A. VianaPublisher:
ISBN:
Category :
Languages : en
Pages : 126
Book Description
Research was conducted in 1981 and 1982 to quatify losses due to stalk breakage and dropped ears caused by 2nd-generation European corn borer under present corn production systems in Indiana. Insecticide treated and untreated portions of corn fields were compared at all test locations. Artificial infestation was achieved by pinning 2 egg masses (near hatching) through the leaf midrib of the ear leaf during the period of pollen shed. Chlorpyrifos (0.96 kg a.i./ha) was applied 1 or 2 times using a solo 425R knapsack sprayer and a Hi-BoyR sprayer in 1981 and 1982 experiments, respectively. Control was determined by counting entrance holes in the stalk and cavities caused by corn borer feeding in the stalk and ear shank. Stalk breakage before harvest was categorized as to its location in the stalk as top, above-ear, below-ear and bottom. Plants with visible ear shank damage were noted. Ears dropped to the ground before harvest and unpicked ears after harvest were counted and collected. Number of entrance holes was reduced by insecticide application in all experiments. The number of stalk cavities was lower in insecticide=treated plots than in untreated plots in all experiments, although nor significantly different in the 1981 experiment. Insecticide application had an effect on number of the borer cavities in the ear shank only in the 1981 experiment. Grain weight was higher in plots with insecticide application than no-insecticide treatment in 1981. No difference in grain weight was detected in 1982. the number (...).
The Survival of European Corn-borer Larvae in Barns and Other Storage Places
Author: L. B. ScottSurvival, Development and Plant Damage of the European Corn Borer, Ostrinia Nubilalis (Hbn.), on Opaque-2 and Normal Corn
Author: Mark Bernard WindelsEffect of Temperature on the Survival and Development of the European Corn Borer, Ostrinia Nubilalis (Hubn)
Author: Manuel Blantran de RozariPublisher:
ISBN:
Category :
Languages : en
Pages : 116
Book Description
Injury by Late Instar European Corn Borer
Author: Karla Ann WalkerPublisher:
ISBN:
Category :
Languages : en
Pages : 102
Book Description
Bt levels in event 176 were effective in controlling late-instar 0. nubilalis larvae during V8, V12, and V16 corn developmental stages. 0. nubilalis tunneling increased, however, during R1, R3, R4, and R5 corn developmental stages. DBT418 was not effective in controlling late-instar 0. nubilalis larvae during corn vegetative or reproductive stages of development. This study also shows Bt corn is more susceptible to late instars during the reproductive stages of corn development, especially after the milk stage (R3).
Post-diapause and Larval Development of the European Corn Borer, Ostrinia Nubilalis (Hübner) (Lepidoptera, Pyralidae), in North Dakota
Author: Mark William HoardPublisher:
ISBN:
Category : European corn borer
Languages : en
Pages : 188
Book Description
Spatial Distribution of the European Corn Borer, Ostrinia Nubilalis (Hübner) (Lepidoptera:Crambidae), and Response of Its Parasitoid Macrocentrus Grandii Goidanich (Hymenopter: Braconidae) to Host Spatial Heterogeneity
Author: Cynthia Lee HsuEffects of Second Generation European Corn Borer, Ostrinia Nubilalis (hübner) on Grain Yield of Corn, Zea Mays (L.), in Eastern North Carolina
Author: Odidika Christian UmeozorPublisher:
ISBN:
Category :
Languages : en
Pages : 98
Book Description