品北农林升款大等 NORTHW国图T A&F UNIV到RsIT型 3.Life Cycle 1)Life cycle types(生活周期型 >Anholocyclic Life Cycle(全周期 Living in greenhouses in northern China and cotton fields in tropic zones.Parthenogenesis year round cycle;no sexual aphids observed. 888880 26
26 1) Life cycle types (ナ9趨鸚繁 ) Anholocyclic Life Cycle (ュ傑趨鸚 ) Living in greenhouses in northern China and cotton fields in tropic zones. Parthenogenesis year round cycle; no sexual aphids observed. 3. Life Cycle
西北农林升枚大学 2)Population characteristics in cotton fields Seedling aphids(蚜)：Occur during seedling stage Local distributed stage:before early- mid May. Severe damage stage:From late May to early June Extinction stage:early-mid June. 88886 2
27 2) Population characteristics in cotton fields Seedling aphids (庪㱰): Occur during seedling stage Local distributed stage: before earlymid May. Severe damage stage: From late May to early June Extinction stage: early-mid June.
品北农林升枚大学 2)Population characteristics cotton fields Summer aphids(蚜)：A biotype or ecotype appearing during summer.Smaller than normal aphids,have a yellow body and are able to endure higher temperatures than autumn and seedling aphids.Often cause the most severe damage in July and Aug. Disappear as aphid mould outbreaks. Autumn aphids(蚜)：Cause damage in Sep.and Oct. 88:8860 28
28 2) Population characteristics in cotton fields Summer aphids (荏㱰): A biotype or ecotype appearing during summer. Smaller than normal aphids, have a yellow body and are able to endure higher temperatures than autumn and seedling aphids. Often cause the most severe damage in July and Aug. Disappear as aphid mould (㱰䳝炕) outbreaks. Autumn aphids (⊕㱰): Cause damage in Sep. and Oct
4.Behavior 西北农林升杖大等 ORTHWEST A&F UNIVERSIT型 > 1)Polyphagous pest;many hosts recorded >2)10-30 generations annually;a generation every 4-5 days in summer. >3)Winged and migratory aphids Adult aphids generally remain wingless until high population densities are reached.A high population density induces the production of winged individuals which can migrate to new food sources. 8888 29
29 1) Polyphagous pest; many hosts recorded 2) 10-30 generations annually; a generation every 4-5 days in summer. 3) Winged and migratory aphids : Adult aphids generally remain wingless until high population densities are reached. A high population density induces the production of winged individuals which can migrate to new food sources. 4. Behavior
品北农林升枚大学 四ORTHW国T A&F UNIVERSIT型 Monitoring and Management 1)Survey methods >Counting > Grading statistics >Yellow board trapping 888880 30
30 Monitoring and Management 1) Survey methods Counting Grading statistics Yellow board trapping