Journal•
Vegetable Report
About: Vegetable Report is an academic journal. The journal publishes majorly in the area(s): Population & Aphid. Over the lifetime, 120 publications have been published receiving 210 citations.
Topics: Population, Aphid, Thrips, Powdery mildew, Drip irrigation
Papers published on a yearly basis
Papers
Journal Article•
TL;DR: Overall, whitefly control in Arizona cotton remained excellent in the 2000 season and there were no reported field failures, however, there was a significant decrease in susceptibility to Applaud of whiteflies collected from cotton, and factors that could undermine the current success of whitefly resistance management in Arizona are discussed.
Abstract: Arizona cotton experienced a severe crisis in 1995 stemming from resistance of whiteflies to synergized pyrethroid insecticides. The insect growth regulators (IGRs), Knack® (pyriproxyfen) and Applaud® (buprofezin), served a pivotal role in resolving this problem. Similarly, Admire® (imidacloprid), the first neonicotinoid insecticide to obtain registration in Arizona, has been the foundation of whitefly control in vegetables and melons. In this paper we provide an update regarding the susceptibility to key insecticides of whiteflies from Arizona cotton, melons, and greenhouses. Overall, whitefly control in Arizona cotton remained excellent in the 2000 season and there were no reported field failures. However, there was a significant decrease in susceptibility to Applaud of whiteflies collected from cotton. One collection from Eloy, Arizona, in 2000 had susceptibility to Applaud that was reduced 129-fold relative to a reference strain. Whiteflies resistant to Knack, detected for the first time in Arizona in 1999, were again detected in 2000 but at lower frequencies than in 1999. Though whiteflies resistant to Admire/Provado® continued to be found at specific locations, overall susceptibility to Admire/Provado in 2000 remained high in whitefly collections from cotton. The new neonicotinoid insecticides, thiamethoxam and acetamiprid, were similar in toxicity to Arizona whiteflies in laboratory bioassays and we confirmed the significant but relatively low-order cross-resistance we previously reported between these neonicotinoids and Admire/Provado. Arizona whiteflies continued to be relatively susceptible to mixtures of Danitol® (fenpropathrin) and Orthene® (acephate). Factors that could undermine the current success of whitefly resistance management in Arizona are discussed. These include: 1) more severe resistance to IGRs in whiteflies from cotton, stemming from increased IGR use within and outside of cotton; 2) resistance of vegetable, melon and greenhouse whiteflies to the various formulations of imidacloprid (Admire, Provado, Merit®, Marathon®); 3) the imminent registration of new neonicotinoid active ingredients in cotton, greenhouses and other Arizona crops. _____________________ This is a part of the University of Arizona College of Agriculture 2001 Vegetable Report, index at: http://ag.arizona.edu/pubs/crop/az1252/
21 citations
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13 citations
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11 citations
Journal Article•
TL;DR: There are several new experimental insecticides currently being tested that offer excellent activity on many of the key pests that infest desert vegetables and melons.
Abstract: The number of effective insecticides currently available to growers for insect control in melons and vegetables is relatively small compared with other crops. Furthermore, with the uncertainty surrounding the Food Quality Protection Act, as well as increasing environmental concerns, the vegetable industry in the western U.S. could potentially be facing the loss of a number of important insecticides. Consequently, there is speculation that some of the more broadly toxic compounds may be removed from the market in the next few years, and the organophosphate and carbamate insecticides are being targeted as prime candidates for reduced usage. As these older chemicals are lost, the introduction of replacement products that can live up to both regulatory and grower standards will be critical. Fortunately, there are several new experimental insecticides currently being tested that offer excellent activity on many of the key pests that infest desert vegetables and melons.
11 citations
Journal Article•
TL;DR: In this paper, the authors evaluated the efficacy of several additional chemistries for efficacy in suppressing development of root and crown rot on pepper plants grown in soil naturally infested with Phytophthora capsici in a greenhouse environment.
Abstract: Phytophthora blight of peppers (Capsicum annuum) is caused by the oomycete pathogen Phytophthora capsici. In Arizona, the root and crown rot phase of the disease initially can appear on plants early in the growing season in areas of the field where soil remains saturated with water after an irrigation or rainfall event. Disease severity can increase dramatically due to summer rains during July and August in the southeastern Arizona production area. Fungicides are an important component of a Phytophthora disease management system, when used in combination with other management practices such as crop rotation, raised beds, and water management. The efficacy of the systemic fungicide mefenoxam (Ridomil Gold) for control of Phytophthora blight on pepper has been documented; however, in many pepper production regions, populations of the pathogen insensitive to this fungicide have developed. Other chemistries, including dimethomorph (Acrobat) as well as some new fungicides in development, have activity on some species of Phytophthora and associated diseases on crops other than pepper. The objective of the following study was to evaluate these additional chemistries for efficacy in suppressing development of root and crown rot on pepper plants grown in soil naturally infested with Phytophthora capsici in a greenhouse environment. The mean duration of survival for Aristotle bell pepper plants in untreated soil infested with P. capsici was 29 days. On the other hand, a significant increase in pepper plant survival was achieved when soil was treated with Reason (fenamidone) + Previcur Flex (propamocarb), SA-110201, Ranman (cyazofamid), Omega (fluazinam), Ridomil Gold (mefenoxam), V-10161(fluopicolide), Forum (dimethomorph), NOA-446510 (mandipropamid), IR-6141 (kiralaxyl), and Maestro (captan). The data from this study suggest that several fungicides currently not registered for use on peppers may be effective components of a management program for Phytophthora crown and root rot. The data is promising; however, additional studies in field soil naturally infested with P. capsici are needed to confirm these preliminary findings as well as to determine the optimal application rate and timing for each new chemistry.
8 citations
Related Journals (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2008 | 10 |
| 2006 | 5 |
| 2005 | 3 |
| 2004 | 6 |
| 2003 | 5 |
| 2002 | 8 |