Temperature thresholds and thermal requirements for development and survival of dysmicoccus brevipes (Hemiptera: Pseudococcidae) on table grapes.
Temperature is an important climate factor that has a direct influence on insect biology and consequently a crucial role in forecasting and integrated pest management. The mealybug Dysmicoccus brevipes (Cockerell) (Hemiptera: Pseudococcidae) is one of the most common species in Brazilian vineyards. Here, development and survival of D . brevipes on leaves of table grapes ( Vitis vinifera cv. Itália) were studied at five constant tem- peratures (15, 20, 25, 28, and 30 ± 1°C) under laboratory conditions. We investigated the developmental time and nymphal survival, temperature thresholds, and the degree-day requirements for each life stage of D . brevipes . The developmental time for the nymphal stage ranged from 32 to 130 days with decreasing the temperature, with the temperatures of 28 and 30°C providing the shorter developmental time. Survival of the entire nymphal stage was affected by the temperature, ranging from 81% at 20°C to 1% at 15°C. The predicted upper lethal temperature was 34.5°C, while the optimal temperature was 28.6°C. The minimum threshold for total devel- opment of D . brevipes occurred at 8.2°C. Dysmicoccus brevipes required 678.4 degree-days to complete development from first-instar nymph to adult. The temperature of 30°C was the most suitable for the development of D . brevipes. The thermal thresholds estimated for D . brevipes life cycle suggest that this species can develop in different table grape-producing regions of Brazil, in a temperature range between 8 and 35°C.
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Artigo de periódico biblioteca |
| Language: | English eng |
| Published: |
2018-08-10
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| Subjects: | Pineapple mealybug, Thermal constant, Lower developmental threshold, Optimal temperature, Vitis Vinifera, Dysmicoccus Brevipes, Insect biology, |
| Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1094057 |
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