Morphology, life history and control of phalaenopsis springtail (Lepidocyrtus near cyaneus Tullberg) (Collembola : Entomobryidae)
| Autor: | Jun-Ji Chen, 陳俊吉 |
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| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 Lepidocyrtus near cyaneus Tullberg belongs to Class Insect, Order Collembola, Family Entomobryidae. Body length 0.75mm. Antennae and legs without scale. Antennae 4 segmented, 1.6 times as long as head. Antennal segment ratio as 1:2:2:4. Eyes 8+8, with 3 interocular setae. Claws paired. Unguis with 2 inner teeth. Unguiculus lanceolate. The ventral tube, tenaculum and furca are positioned ventrally on abdominal I, III and IV, respectively. The genital aperture is positioned ventrally on abdominal V and consists of a transverse slit in the female and longitudinal slit in the male. At 25 and 30℃, the egg stage lasted for 4.3 and 2.9 days, respectively. The hatching rates are 69.2% at 25℃and 61.8% at 30℃. Toxicities of 10 insecticides were tested for phalaenopsis springtail. Results showed that chlorpyrifos (40.8% WC 1500x), methamidophos (50% SL 2000x), dimethoate (44% EC 1000x) and deltamethrin (2.8% WC 1000x) were effective to cause 100%, mortalities of phalaenopsis springtail were 100%. Mortalities by acetamiprid (20% SP1000x, methomyl (90% SC 500x) and imidacloprid (9.6% SL 500x) were 96.0%, 90.0% and 81.3%, respectively. Field trailed showed that methamidophos, imidacloprid, methomy, acetamiprid and chlorpyrifos were more effective than other insecticides. Frequency of occurrence springtails could be reduced from 66% to 1% by imidacloprid treatment. Application of hot water treatment (65℃, 3 mins; 55℃, 5 mins and 50℃, 10 mins) provided 100% control to phalaenopsis springtail on the sphagnum. Key words: Collembola, phalaenopsis springtails, morphology, life history, chemical control, physical control |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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