Al-Abbadi S.Y (2008).
Effect of Different Temperatures on the Biological Characteristics of the Cereal Leaf Miner
Syringopais temperatella LED. (SCYTHRIDIDAE: LEPIDOPTERA)
Bull. Fac. Agric., Cairo Univ Vol (59) N0 2:142-147
ABSTRACT: - Wheat and barley are two of the most economic and strategic field crops in the rain-fed areas of Jordan. These crops are attacked by different insects, in which the cereal leaf miner, Syringopais temperatella Led. (Scythrididae: Lepidoptera) is the most severe. This study was carried out at the Faculty of Agriculture in the Entomology Research Laboratory with some field observations at Mut`ah University / Al-Karak during 2001/2002 and 2002/2003 growing seasons with average results over two seasons. The effect of three different temperatures (20°, 25° and 30oC) at 70 ± 5% relative humidity and a light period of (8L:16D), on the development and survival of the cereal leaf miner was studied. It was found that 20 oC was the most suitable temperature for development and activities of the insect life stages. At this temperature the results showed that the numbers of emerged eggs of a fertilized female were 26-66 eggs, average eggs incubation period was 12-14 days, the percentage of hatching eggs was 43%, the larval period was 69 days, the percentage of larval mortality was 8%, the pupal period was 15 days, and the adult emergence percentage was 92%. However, at 25 oC the average number of eggs of a fertilized female was 23-56. Average egg incubation period was 10-12 days, the percentage of hatching eggs was 25%, the larval stage period was 59 days, the percentage of larval mortality was 14%, the pupal period was 13 days, and the adult emergence percentage was 86 %. At 30 oC, the results showed that the larval stage period, percentage of larval mortality, pupal period, adult emergence percentage, and average number of eggs of a fertilized female were 51 days, 18%, 11 days, 82%, and 0 eggs, respectively. It was found that the insect has one generation per year, which indicates that 30oC is unsuitable temperature for adult sexual activities, and it died within 3-5 days without mating or laying eggs.
Keywords: biology, cereal leaf miner, life cycle, Syringopais temperatella, temperature.
