An Evaluation of Repetitive Summer Horticultural Oil Sprays on Selected Woody Landscape Plants

The genus Viburnum encompasses a group of about 150 species of evergreen, semi-evergreen or deciduous trees and large shrubs. Viburnums are native to temperate, subtropical and tropical areas of southeastern Asia, eastern North America, Central America, the Caribbean and parts of South America. Native and nonnative Viburnum species have become prominent landscape plants in the southeastern United States due to their beauty, utility, relative ease of maintenance and broad adaptability to the region's climate and soils. Efficient management of viburnum pests to maintain healthy viburnum plants in nurseries and landscape settings is crucial for sustaining the economic competitiveness and profitability of green industry professionals competing in the horticulture marketplace. Diversity of species within the genus, however, is vast, and can contribute to many host-pest complexes that differ among growing environments and cause severe economic or aesthetic losses. Additionally, some abiotic disorders may mimic biotic damage or may render viburnum more susceptible to pests and diseases. This review focuses on viburnum culture in production and landscape settings with an emphasis on major insect and mite pests, plant diseases and abiotic disorders affecting management of Viburnum species in nursery and landscape settings.

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“…americanum, and V. opulus var. americanum 'Alfredo' to control scales, which are sap-feeding insects (Miller 1997).…”

Section: Insect and Mite Managementmentioning

confidence: 99%

Arthropod Pests, Plant Diseases and Abiotic Disorders and their Management on Viburnum Species in the Southeastern U.S.: A Review

Klingeman¹,

White²,

LeBude³

et al. 2014

Journal of Environmental Horticulture

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Threshold‐based spraying decision programmes for the red spider mite Tetranychus marianae on eggplant

Reddy

Kikuchi

Bautista

2012

J Applied Entomology

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The red spider mite, Tetranychus marianae McGregor (Acari: Tetranychidae), has been an important pest of eggplant Solanum melongena L. (Solanaceae) and other vegetables in the Mariana Islands. The damage due to T. marianae has been severe and caused huge economic losses. Because no threshold levels are available for T. marianae, many growers are applying up to 12 chemical applications per eggplant cropping period. This is not only expensive, but also results in lower yields because of extensive foliar damage and development of resistance in mites to chemicals. To diminish the calendar‐based chemical applications and to preclude damage to foliage and fruit quality, this study was undertaken for the development of a threshold level for optimum timing of chemical applications for T. marianae. In the direction of this aim, an attempt was made to generate different threshold levels by applying chemical spray (Sun‐spray 6E, 5 ml/l) within 12 h after reaching the threshold levels at 2, 4, 6, 8 and 10 mites/leaf, as well as current recommended calendar‐based sprays and non‐sprayed control in a replicated block design for the dry and wet seasons of 2010 at two locations (Yigo and Inaranjan) in Guam (USA). Based on T. marianae‐infested leaves, incidence of T. marianae and yield levels, the plots sprayed at 2 or 4 mites/leaf in the dry season and 2–8 mites/leaf during the wet season had significantly lower leaf damage and incidence of T. marianae compared with a greater number of mites/leaf in calendar‐based sprays and control plots. At the greater threshold levels, the mean yield was significantly reduced in comparison with the mean yield obtained when plots were sprayed at a threshold of 2–8 mites/leaf. Therefore, it is concluded that the optimum threshold chemical spray for T. marianae on eggplant is 4 mites/leaf during the dry season and 8 mites/leaf in the wet season.

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An Evaluation of Repetitive Summer Horticultural Oil Sprays on Selected Woody Landscape Plants

Cited by 2 publications

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Arthropod Pests, Plant Diseases and Abiotic Disorders and their Management on Viburnum Species in the Southeastern U.S.: A Review

Arthropod Pests, Plant Diseases and Abiotic Disorders and their Management on Viburnum Species in the Southeastern U.S.: A Review

Threshold‐based spraying decision programmes for the red spider mite Tetranychus marianae on eggplant

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