1,945 research outputs found
TB43: Field Recognition of the Larvae of Native Coccinellidae Common to the Potato Fields of Aroostook County
The adult beetles of the family Coccinellidae are the well-known ladybird beetles or ladybugs. The larvae and adults of the subfamily Coccinellinae are considered beneficial because they feed on pest species, mainly aphids and scale insects. This study was undertaken to provide a means of recognizing the larvae of native coccinellids found in or around the potato fields of Aroostook County. For our purposes, it is desirable to be able to identify the insect quickly and without killing it. Thus, the larval color pattern was chosen as a possible means of identification.https://digitalcommons.library.umaine.edu/aes_techbulletin/1160/thumbnail.jp
The Seiberg-Witten prepotential and the Euler class of the reduced moduli space of instantons
The n-instanton contribution to the Seiberg-Witten prepotential of N=2
supersymmetric d=4 Yang Mills theory is represented as the integral of the
exponential of an equivariantly exact form. Integrating out an overall scale
and a U(1) angle the integral is rewritten as (4n-3) fold product of a closed
two form. This two form is, formally, a representative of the Euler class of
the Instanton moduli space viewed as a principal U(1) bundle, because its
pullback under bundel projection is the exterior derivative of an angular
one-form.Comment: LaTex, 15 page
TB128: Beauveria bassiana for Control of Colorado Potato Beetle (Coleoptera: Chrysomelidae) in Maine
Beauveria bassiana (Balsamo) Vuill. (Bb), a fungal pathogen of the Colorado potato beetle has been used to control CPB in Europe. Preliminary studies in the United States gave promising results for CPB control by using the fungus. Based on these studies, a three-year pilot program was initiated to evaluate the potential for using Bb o control the Colorado potato beetle in the U.S. We report herein on the results obtained in southern Maine from using this mycoinsecticide to control the beetle.https://digitalcommons.library.umaine.edu/aes_techbulletin/1064/thumbnail.jp
TB83: Insecticidal Control of Potato Infesting Aphids in Northeastern Maine
Aphid populations for the growing seasons of 1970, 1971, and 197 2 were variable. It is possible, however, to rate the efficacy of the various insecticides tested in controlling potato-infesting aphids in northeastern Maine. Soil applications of aldicarb and DS 15,647 and foliar application of acephate were the most effective materials tested. The insecticides phosmet (foliar) and phoxim (soil) did not provide much protection against potato-infesting aphids in these tests. Bayer 77,049, parathion, Penick SBP 1382, Sandoz-Wander 52,139 and Uniroyal 840 did not provide effective control of potato-infesting aphids at the rates used in these tests. All other insecticides tested adequately controlled aphid populations, but their effects on the spread of leaf roll varied. Some of the materials tested were experimental materials and not all are available for commercial use.https://digitalcommons.library.umaine.edu/aes_techbulletin/1112/thumbnail.jp
TB55: Food Lists of Hippodamia (Coleoptera: Coccinellidae)
Food lists for Hippodamia iredecimpunctata (Linnaeus) and the genus Hippodamia as reported in the literature are given. A complete list of citations is included.https://digitalcommons.library.umaine.edu/aes_techbulletin/1150/thumbnail.jp
Application of the direct Liapunov method to the problem of symmetric stability in the atmosphere
The problem of symmetric stability is examined within the context of the direct Liapunov method. The sufficient conditions for stability derived by FjĂžrtoft are shown to imply finite-amplitude, normed stability. This finite-amplitude stability theorem is then used to obtain rigorous upper bounds on the saturation amplitude of disturbances to symmetrically unstable flows.By employing a virial functional, the necessary conditions for instability implied by the stability theorem are shown to be in fact sufficient for instability. The results of Ooyama are improved upon insofar as a tight two-sided (upper and lower) estimate is obtained of the growth rate of (modal or nonmodal) symmetric instabilities.The case of moist adiabatic systems is also considered
TB115: Growth and Development of the Colorado Potato Beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae), Fed Foliage of Three Solanum Species
The purpose of this study was to compare growth and development of CPB larvae fed Solanum chacoense and Solanum demissum with those reared on S. tuberosum.https://digitalcommons.library.umaine.edu/aes_techbulletin/1075/thumbnail.jp
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