Sampling and Monitoring Pests and Diseases

Lapchin, Laurent; Shtienberg, D.

doi:10.1007/0-306-47585-5_7

Cited by 3 publications

(2 citation statements)

References 46 publications

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“…Lapchin and Shtienberg (1999) deÞned four main criteria that have to be checked before developing such a system: (1) visible insects on the plant; (2) highly variable insect densities between plants (in space and time); (3) simple and distinct visual classes, with boundaries that are easily recognizable in the Þeld; and (4) stable boundaries in time and space. The two Þrst criteria are fulÞlled in the case of M. euphorbiae on tomato plants.…”

Section: Discussionmentioning

confidence: 99%

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Projection Pursuit Nonparametric Regression Applied to Field Counts of the Aphid <I>Macrosiphum euphorbiae</I> (Homoptera: Aphididae) on Tomato Crops in Greenhouses

Boll¹,

Lapchin²

2002

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The number of plants that sampling requires in aphid population studies often exceeds one hundred. Thus, only quick and nondestructive methods can be used to sample this pest in a reasonable time interval. We propose a visual method for estimating the density of the aphid Macrosiphum euphorbiae (Thomas) on tomato plants reared in greenhouses. After approximately 1min of visual observation plants can be assigned to abundance classes, the boundaries of which are roughly the powers of square root 10. Precise counts were collected simultaneously on sets of reference plants from the same greenhouse. Projection pursuit nonparametric regression was then used to provide unbiased estimates of aphid densities from the abundance classes and several easily gathered explanatory variables. The robustness of the method was evaluated by testing the models on the complementary data sets from plants in which the aphid densities were precisely counted. In both single and twin-row cultural conditions, for the reference and complementary data sets, the order of magnitude of the error was less than one class rank per plant. The investigation time was reduced by approximately 10-fold compared with the exact counting method. This easy-to-teach field method could be useful in large-scale population surveys and for optimizing integrated pest management strategies.

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Section: Discussionmentioning

confidence: 99%

“…Numerous methods (Lapchin and Shtienberg 1999) have been developed to reduce the time spent counting insects collected or observed in samples. These include the use of visual abundance classes.…”

mentioning

confidence: 99%

Projection Pursuit Nonparametric Regression Applied to Field Counts of the Aphid <I>Macrosiphum euphorbiae</I> (Homoptera: Aphididae) on Tomato Crops in Greenhouses

Boll¹,

Lapchin²

2002

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Pest Control in Organic Farming

et al. 2019

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Greenhouse Production of Vegetable Crops Grown With a Closed-Loop Fertigation System in a Pesticide-Free Environment

Cantliffe¹,

Shaw²,

Jovicich³

et al. 2008

Acta Hortic.

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The primary arthropod pests associated with greenhouse vegetable production in Florida are: broadmites, spider mites, thrips, aphids, and whiteflies. The primary disease is powdery mildew. The objective of this research was to identify pesticide-free control measures of the most common arthropod pests of the Florida greenhouse vegetable industry and to recycle water and nutrients, safely without disease pressure. Broadmites and spider mites are controlled with the predatory mite N. californicus if released prior to or at transplanting. Aphids and whiteflies are controlled with the parasitic wasps Aphidius colemani and Eretmoserus sp. or Encarsia sp., respectively, which can be released and/or reared on banker plants. Thrips populations can be reduced with generalist predators such as Orius sp., but more recently a predatory mite, Amblyseius swirskii has been reported to be effective. Disease resistant cultivars are preferred, however, cultural controls such as isolation from disease pressure, anti-condensation coverings, fans and aeration and bio-friendly fungicides are necessary. Regular scouting and correct identification of pests is key to pest management and implementing biological control. Plants were fertigated in a hydroponic system using pine bark or perlite medium in nursery pots. Drainage water was collected, sanitized, adjusted for EC and pH when necessary, then recycled to the plants. A sustainable, pesticide-free environment is not only safer for the plants and produce being grown, but also, employee safety and efficiency can be increased since re-entry periods that delay worker production are eliminated.

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Sampling and Monitoring Pests and Diseases

Cited by 3 publications

References 46 publications

Projection Pursuit Nonparametric Regression Applied to Field Counts of the Aphid <I>Macrosiphum euphorbiae</I> (Homoptera: Aphididae) on Tomato Crops in Greenhouses

Projection Pursuit Nonparametric Regression Applied to Field Counts of the Aphid <I>Macrosiphum euphorbiae</I> (Homoptera: Aphididae) on Tomato Crops in Greenhouses

Pest Control in Organic Farming

Greenhouse Production of Vegetable Crops Grown With a Closed-Loop Fertigation System in a Pesticide-Free Environment

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