英文摘要 |
"Various aspects of oviposition of the tomato fruitworm(TFW), Helicoverpa armigera(Hübner), on tomato plants were studied in the laboratory and a greenhouse. The objectives of the study were to determine the preference of the TFW for various phenological stages of the host plant for egg laying, and the influence of the presence of prior oviposited eggs on fresh egg laying, as well as to confirm whether the TFW marks its eggs or oviposition substratum while ovipositing on tomato plants. TFW females preferred to lay eggs on tomato plants in the flowering stage rather than the vegetative stage. Removal of flowers from flowering plants or placing fresh tomato flowers on plants in the vegetative growth stage did not change oviposition behavior. The physiological status of plants in the flowering stage, rather than the mere physical presence of flowers, appeared to attract TFW adults for oviposition. TFW females avoided egg laying or laid fewer eggs on plants which had previously been used for oviposition compared to plants with no previously eggs laid. Neither the presence of manually placed live or dead eggs, nor the removal of naturally laid eggs from tomato plants changed the oviposition behavior of the TFW. The presence of damage to fruit inflicted by the TFW reduced the subsequent number of eggs laid on such plants compared to plants with no damage to the fruit. Ovipositing females did not seem to mark their eggs or host plants with their body scales while laying eggs, as the presence of TFW adult body scales on tomato plants did not affect oviposition behavior." |