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Advances in Crop Science and Technology

.: Home > Advances in Crop Science and Technology > 2014 > Volume 2 Number 4 > Yan Chen 1* , Richard Story 2 , and Michelle Samuel-Foo 3

Effects of Nitrogen and Phosphorous Fertilization on Western Flower Thrips Population Level and Quality of Susceptible and Resistant Impatiens

Yan Chen 1* , Richard Story 2 , and Michelle Samuel-Foo 3
1 LSU Agricultural Center Hammond Research Station, 21549 Old Covington Highway, Hammond, LA 70403, USA 2 LSU Agricultural Center Department of Entomology, 404 Life Sciences Building, LSU, Baton Rouge, LA 70803, USA 3 University of Florida, IR-4 Southern Region Program, Gainesville, FL 3261, USA
Abstract :

Impatiens  (Impatiens  wallerana)  cultivars  ‘Super  Elfin  Red’  and  ‘Dazzler  Violet’,  resistant  or  susceptible, respectively, to western flower thrips (Frankliniella occidentalis) were grown under 112 or 336 mg∙L-1 N in combination with 10, 20, or 40 mg∙L-1 P to investigate the effect of fertilization and host plant resistance on thrips population level and plant quality. Half of the plants were inoculated with thrips at two weeks after fertigation treatments began (WAT) and sampled at 4 and 8 WAT. For thrips-free plants, both N rates and the two higher P rates resulted in market- quality  plants  with  various  tissue  N  and  P  concentrations.  Plant  quality  was  lower  in  thrips-infested  plants  due  to  thrips damage to foliage as distortion on expending leaves and browning on edges of fully expended leaves. Higher numbers of adult and immature thrips were found in ‘Dazzler Violet’ than ‘Super Elfin Red’. However, distortion index, which represented degree of distortion on young leaves, was higher in the resistant cultivar, and the two cultivars had  similar  quality  ratings  at  8  WAT.  For  both  cultivars,  N  had  no  effect  on  thrips  population,  and  plants  fertilized  with 20 or 40 mg∙L-1 had higher number of thrips than the low rate. However, percentage of damaged leaf area, which represented the severity of browning, was found higher in plants fertilized at the low P rate. As a result, both cultivars fertilized with higher P rates had better plant quality although these plants had more thrips. Therefore, when infestation level is moderately low, i.e. 10 thrips per plant, plant nutrient status favoring thrips development may not necessarily result in lower plant quality. The final outcome of plant marketability is a combination of plant growth, thrips damage, and the ability of plants to compensate for pest damage.

Keywords :
Effects of Nitrogen and Phosphorous Fertilization on Western Flower Thrips Population Level and Quality of Susceptible and Resistant Impatiens

Date Deposited : 05 Apr 2016 15:36

Last Modified : 05 Apr 2016 15:36

Official URL: http://www.esciencecentral.org/journals/archive-advances-in-crop-science-and-technology-open-access.php

Volume 2, Number 4, November 2014 , ISSN ISSN: 2329-8863

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