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Effect of the greenhouse whitefly on yields of greenhouse tomatoes.

Trialeurodes vaporariorum (Westwood) significantly reduced yields of greenhouse tomatoes. Plants were sprayed with endosulfan 50 wettable powder, 0.06% active ingredients, at 5-, 10-, and 15-day intervals or were left untreated during the growth of a spring crop. Number of fruits and weight per fruit were recorded from clusters 2–10. Yields from plants sprayed at 5- and 10- day intervals were significantly higher than from untreated plants. Average yields were 628.26, 574.49, 560.34, and 495.25g per cluster for the 3 treatment intervals and untreated plants, respectively.

Greenhouse whitefly adults and nymphs were recorded at intervals for 70 and 105 days, respectively. Compared with untreated plants, significantly fewer adults and nymphs were recorded from plants in all spray treatments.

Under the conditions of this experiment, if plants were sprayed at 5-day intervals, a commercial grower would increase his gross income by approximately $8000 per acre.