Full Article: PDF
Scientific Object Identifier: http://s-o-i.org/1.1/TAS-10-114-21
DOI: https://dx.doi.org/10.15863/TAS.2022.10.114.21
Language: English
Citation: Mamatov, K. Sh. (2022). The development of cotton bollworm (Helicoverpa armigera Hbn.) In tomatoes grown in greenhouse conditions and the criterion of economic threshold. ISJ Theoretical & Applied Science, 10 (114), 117-121. Soi: http://s-o-i.org/1.1/TAS-10-114-21 Doi: https://dx.doi.org/10.15863/TAS.2022.10.114.21 |
Pages: 117-121
Published: 30.10.2022
Abstract: The article presents the results of experiments on the development of bollworm (Helicoverpa armigera Hbn.) in tomatoes grown in greenhouse conditions and the criterion of economic risk. In this case: the 1st-year-old worms first feed on the leaves at the point of growth, then the 2-3-year-old worms damage the pods and flowers, and the older worms damage the fruit and make it unfit for consumption, and the hatched worm develops in greenhouse conditions for 25-30 days. 20-25 pods, flowers and fruits were destroyed. Egg-laying of mature breeds continued for 15-20 days in tomato. At air temperature of 27 °C and humidity of 60-65%, it was observed that the average number of eggs laid by butterflies is 300-400. It has been confirmed in the conducted experiments that the criterion of economic threshold of cotton bollworm in greenhouse conditions during the fruit ripening period was 0.06 per plant i.e. 6 per 100 plants. So in greenhouse conditions the economy threshold of cotton bollworm is 6 units per 100 plants, which means that it is expedient to carry out protection measures against the pest from this period.
Key words: Greenhouse, plant, tomato, harvest, flowering, fruiting, pest, cotton bollworm, egg, worm, butterfly, mature breed, food.
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