| Autor: |
RASHEV, Stefan, GEORGIEV, Stoyan, NEDYALKOVA, Spasimira, IVANOVA, Sara, PALAGACHEVA, Nedyalka |
| Předmět: |
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| Zdroj: |
Agriculture & Forestry / Poljoprivreda i šumarstv; 2023, Vol. 69 Issue 4, p221-232, 12p |
| Abstrakt: |
The cultivation of sweet corn is accompanied by a number of plant protection problems. It is attacked by lot of pest, cause significant damage to the cobs, deteriorate the commercial properties and cause significant economic losses. In this regard, surveys were conducted in the period 2019-2020 in the sweet corn fields in the area of the village of Planinitsa, Burgas region, Bulgaria. Standard entomological methods were used to estimate pest densities. A mixture of plant extracts from walnut (Juglans regia L.), ailanthus (Ailanthus altissima Swing.) and tobacco (Nicotiana tabacum L.) was tested against cotton bollworm caterpillars (Helicoverpa armigera Hübner). Sweet corn is attacked by a large number of omnivorous and specialized pests. Two critical periods are: Period I-phase 5th-7th leaf, in relation to weevils; and Period II-the paniclephenophase, when european corn borer (Ostrinia nubilalis Hübner) and cotton bollworm (Helicoverpa armigera Hübner) appear. In 2019, 5% of cobs were reported as damaged by corn borer and 35% - by cotton bollworm, and in 2020, 10% and 65%, respectively. The data from the obtained results show that the mixture of plant extracts exhibits good efficacy and can be included as an alternative means of controlling cotton bollworm in integrated plant protection systems. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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