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Eflfect of Trialeurodes Vaporariorum (Homoptera: Aleyrodidae) on Yield of Fresh Market Tomatoes

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Eflfect of Trialeurodes Vaporariorum (Homoptera: Aleyrodidae) on Yield of Fresh Market Tomatoes HORTICULTURAL ENTOMOLOGY EflFect of Trialeurodes vaporariorum (Homoptera: Aleyrodidae) on Yield of Fresh Market Tomatoes M. W. JOHNSON, L. C. CAPRIO,1 J. A. COUGHLIN,2 B. E. TABASHNIK, J. A. ROSENHEIM,3 AND S. C. WELTER4 Department of Entomology, University of Hawaii at Manoa, Honolulu, HI 96822 J. Econ. Entomol. 85(6): 2370-2376 (1992) ABSTRACT EflFect of the feeding of immature greenhouse whitefly, Trialeurodes vapo- rariorum (Westwood), and sooty mold contamination on tomato production was deter- mined using small field plots. Total and grade-A fruit weights harvested were correlated negatively with cumulative immature greenhouse whitefly days (=pest-days). Effects of T. vaporariorum feeding on tomato yield were influenced by environmental factors. Per- centages of fruit contaminated with sooty mold were correlated positively with cumulative immature greenhouse whitefly days. Cumulative immature greenhouse whitefly days were correlated positively with peak immature whitefly densities during the growth cycle of the plant. Results suggest that tomatoes grown in Hawaii may incur a 5% yield loss in grade-A fruit at about greenhouse whitefly levels as low as 70 cumulative greenhouse whitefly days per cm2 tomato leaflet (=a peak density of 0.7 immature greenhouse whitefly per cm2 tomato leaflet per day) due primarily to the consumption of plant assimilates by T. vapo- rariorum. Compared with direct greenhouse whitefly feeding, contamination of fruit with sooty mold was less important with respect to reducing overall crop yields. A 5% reduction in grade-A fruit due to sooty mold contamination was estimated at =300 cumulative greenhouse whitefly days per cm2 tomato leaflet (=a peak density of 8.3 immature green- house whitefly per cm2 tomato leaflet). KEY WORDS Greenhouse whitefly, Trialeurodes vaporariorum, tomato FRESH MARKET TOMATOES are one of Hawaii's whitefly is probably of the greatest significance most important vegetable crops; their value was because of its frequent infestation of tomato and =3 million dollars in 1989 based on production other vegetable crops across the state (M.W.J., from 101 ha (Anonymous 1990). Like many of unpublished data). Many growers routinely ap- Hawaii's vegetable crops, tomatoes are infested ply pesticides to suppress greenhouse whitefly by numerous pests (Mau 1983) that cause direct populations. These applications can lead to pop- and indirect damage. Direct pests of the fruit ulation increases in greenhouse whitefly as well include the tomato fruitworm, Helicoverpa zea as the Liriomyza leafminers (M.W.J., unpub- (Boddie); tomato pinworm, Keiferia lycopersi- lished data). Frequently, neighboring vegetable cella (Walsingham); beet armyworm, Spodoptera crops are inundated by dispersing greenhouse exigua (Hiibner); melon fly, Dacus cucurbitae whitefly adults following the senescence or de- Coquillett; and southern green stinkbug, Nezara cline of an infested planting. viridula (L.). Indirect pests include Liriomyza Injury to tomato plants by T. vaporariorum is leafminers; western flower thrips, Frankliniella caused by phloem feeding of immatures and occidentalis (Pergande); sweetpotato whitefly, adults on tomato foliage and the growth of sooty Bemisia tabaci (Gennadius); and greenhouse mold in honeydew produced during greenhouse whitefly, Trialeurodes vaporariorum (West- whitefly feeding (Lloyd 1922, Hussey et al. 1969, wood). Of these indirect pests, greenhouse Lindquist 1972, Byrne et al. 1990). Detailed studies quantifying the yield response of toma- toes to the direct effects of T. vaporariorum feed- ing are lacking (Byrne et al. 1990). Lindquist et 1 Current address: Department of Entomological Sciences, University of California, Berkeley, CA 94720. al. (1972) reported reduced yields of greenhouse 2 Current address: Department of Environmental Biochem- grown tomatoes due to greenhouse whitefly istry, University of Hawaii at Manoa, Honolulu, HI 96822. feeding but did not relate whitefly densities to 3 Current address: Department of Entomology, University of losses in tomato yield. They suggested that T. California, Davis, CA 95616. 4 Department of Entomological Sciences, University of Cal- vaporariorum populations be maintained at low ifornia, Berkeley, CA 94720. levels throughout the crop production cycle to 0022-0493/92/2370-2376$02.00/0 © 1992 Entomological Society of America December 1992 JOHNSON ET AL.: GREENHOUSE WHITEFLY ON TOMATO 2371 produce maximum yields but did not quantify Materials and Methods the greenhouse whitefly level. Based on Lloyd Two field studies were conducted at the Uni- (1922) and Hussey et al. (1969), Byrne et al. versity of Hawaii Branch Experiment Station at (1990) concluded that economic losses result- Poamoho, Oahu, HI, during July-October 1987 ing from growth of sooty mold on honeydew and April—July 1988, respectively. For each on vegetables was the greatest impact caused study, 16 small field plots (36.1 m rows each) by T. vaporariorum on those crops. Low inci- containing 60 tomato plants each (=2,352 plants dence of sooty mold can be tolerated, but must per hectare) were established in a randomized be washed off fruit before shipment to market. complete-block design. Plants (Celebrity hybrid, Fruit heavily covered with sooty mold are usu- Harris Moran Seed, Rochester, NY) were trans- ally unacceptable for sale. Hussey et al. (1969) planted on 20 July 1987 and 28 March 1988. reported that a mean of =25 greenhouse whitefly Plants were grown according to local practices nymphs per cm2 of tomato apical leaflet resulted (irrigation, fertilizer, staking, etc.), which in- in s=30% of the total fruit harvested contaminated cluded pruning field-grown plants in a manner with sooty mold growth. They suggested that similar to pruning of greenhouse-grown toma- greenhouse whitefly populations be limited to toes. During the studies, daily high and low tem- =»7 nymphs per cm2 of tomato apical leaflet to peratures and daily total solar radiation (LI-COR avoid economically significant sooty mold con- LI-200S Pyranometer Sensor and LI-500 Integra- tamination on fruit. Physiological studies indi- tor, LI-COR, Lincoln, NE) were recorded. cate that healthy, unstressed tomato plants pro- . Each study included four experimental treat- duce more photosynthates than needed for ments comprising different levels of immature growth and fruit production (Tanaka & Fujita greenhouse whitefly: near zero, low, medium, 1974; Tanaka et al. 1974a,b). Thus, removal of and high densities. Whitefly densities were ma- plant assimilates by greenhouse whitefly feed- nipulated by the application of insecticides at ing may not effect fruit weight or size signifi- various times during the crop cycle. The near- cantly. zero density treatment received weekly insecti- cide applications to maintain the lowest whitefly Densities at which indirect pests cause signif- densities possible. The high-density treatment icant damage depend on several parameters, in- never received insecticide treatments directed at cluding the specific type of injury induced, the T. vaporariorum, so that pest numbers would not plant's response to the injury, the change in pest be suppressed. Low- and medium-density treat- densities over time, and environmental condi- ments received intermediate numbers of insec- tions (Sances et al. 1982; Welter 1989; Welter et ticide applications to establish low to moderate al. 1984, 1989, 1990; Rosenheim et al. 1990). whitefly populations. To reduce the impact of Field-grown plantings may respond differently foliage and fruit-feeding arthropods other than to pest injury than greenhouse crops. The impact greenhouse whitefly on fruit production, these of a pest is not necessarily correlated with the species were maintained at zero to low densities weekly densities or seasonal average density ob- in all experimental plots by applications of selec- served in a planting. Although pest density indi- tive insecticides. cates a level of pest impact, it does not account In 1987, permethrin (Ambush 2 EC [emulsifi- for the length of time the pest density remains at able concentrate], 0.224 kg (AI)/ha; ICI Ameri- a given level. Ruppel (1983) suggested the use of cas, Wilmington, DE) and oxamyl (Vydate 2L "insect-days" to better quantify this impact. One [liquid], 1.12 kg (AI)/ha; E. I. DuPont de Nem- insect day (or pest day) is equivalent to one in- ours, Wilmington, DE) were applied to the near- dividual member of a given pest species feeding zero treatment on 7, 14, 21, and 28 August; 4, 11, for 1 d. 17, and 24 September; and 2, 9, and 16 October Quantification of the response of fresh market to suppress greenhouse whitefly. Permethrin tomatoes to injury caused by greenhouse white- and oxamyl applications were made in the low- fly would enable estimation of the maximum ac- density plots on 28 August; 4 and 11 September; ceptable levels of T. vaporariorum infestation. and 9 and 16 October and in the medium-density Based on this information, economic injury lev- plots on 2 October. Avermectin (Avid 0.15 EC, els and density treatment levels could be estab- 0.022 mg (AI)/ha; MSD AGVET, Rahway, NJ) lished along with consultant or grower-usable was applied to all plots on 28 August and 4 Sep- sampling programs. Additionally, the required tember to reduce live Liriomyza larval densities effectiveness of biological or cultural controls to fewer than two per tomato leaflet. Malathion (5 could be expressed in terms of maximum allow- EC, 1.4 kg Al/ha; Platte Chemical, Fremont, NE) able pest population levels.
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