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The Physiological Ecology Of A Migratory Noctuid Moth, The Velvetbean Caterpillar (Anticarsia Gemmatalis Hubner) (Density, Plant Age, Juvenile Hormone)., Howard William Fescemyer
The Physiological Ecology Of A Migratory Noctuid Moth, The Velvetbean Caterpillar (Anticarsia Gemmatalis Hubner) (Density, Plant Age, Juvenile Hormone)., Howard William Fescemyer
LSU Historical Dissertations and Theses
Velvetbean caterpillars, Anticarsia gemmatalis Hubner, were reared at different densities on soybean. The degree of dark pigmen- tation was density-dependent under field and laboratory conditions. The highest degree of dark pigmentation was expressed in the last instar when larvae were crowded throughout development. Soybean plant age had no effect on the degree of dark pigmentation. Larval development was delayed and one-day-old adult weight was decreased as the larval density and plant age increased. Size and biochemical composition of one-day-old A. gemmatalis adults was investigated in relation to larval pigmentation, larval den- sity and plant age. Wet, dry and protein weights …
Damage Threshold And Sampling Methodology Of The Southern Green Stink Bug, Nezara Viridula (L.) On Fresh Market Tomatoes., Ben-Huai Lye
Damage Threshold And Sampling Methodology Of The Southern Green Stink Bug, Nezara Viridula (L.) On Fresh Market Tomatoes., Ben-Huai Lye
LSU Historical Dissertations and Theses
The effect of tomato fruit size and SGSB density and feeding duration on tomato circumference, weight, and days to maturity, as well as SGSB feeding frequency as indicated by the deposition of stylet sheaths, was quantified. Density and feeding duration had a significant effect on all four damage indices. The interactive effect of density and feeding duration were nonsignificant across all fruit damage indices. Feeding damage induced an early maturity of fruit and thereby reduced fruit size and weight. Both density and feeding duration significantly affected fruit grade. Because of highly significant interactions among grade, density, and feeding duration, the …
The Threecornered Alfalfa Hopper On Soybean: Determination Of Damaging Stages, Development Of Sampling Methodology, Refinement Of The Action Threshold, And Evaluation Of Insecticidal Control (Spissistilus Festinus, Glycine Max)., Alton Neal Sparks Jr
LSU Historical Dissertations and Theses
Experiments conducted in soybean, Glycine max (L.) Merrill, fields in 1983 and 1984 demonstrated that damage by both adults and nymphs of the second generation of the threecornered alfalfa hopper, Spissistilus festinus (Say), on soybean (third generation of the year) contribute to yield reduction. Results indicated nymphs were responsible for 45-60% of the total yield reduction. The vertical beat sheet, ground cloth, and beat net techniques for sampling S. festinus nymphs were evaluated in soybean fields utilizing systematic and random sampling. Based on the proportion of the population sampled, the relative variation, and regression on subsequent adult counts, the best …