Location: Invasive Plant Research Laboratory
2013 Annual Report
Field surveys will include monitoring of non-target plant species growing with Rhodomyrtus in the field for any evidence of activity by targeted insects. Because of the relatively widespread occurrence of the plant in Southeast Asia, surveys will cover a range of climatic and site variables. Experienced local botanists and entomologists will be consulted wherever appropriate and identified specimens will be lodged in local collections. Evidence of parasitism of prospective agents will be investigated and this will supplement information on any seasonal variations of herbivore populations observed during regular surveys. Identification of specimens will rely on local specialists as well as group experts in the USA, particularly at the USDA/ARS Systematic Entomology Laboratory (SEL), Beltsville, Maryland.
• Conduct exploratory surveys for biological control agents of R. tomentosa to be completed in Hong Kong, provinces of southern mainland China and other countries of Asia when/where possible and to produce an inventory of potential biological control agents for all locations in the native range. • Seasonality of all agents will be investigated through surveying R. tomentosa throughout the year in the native range. • Idiophantis will be collected from Hong Kong or mainland China and shipped to IPRL quarantine in Florida. • Carea varipes will be collected from Asia and shipped/hand-carried to USDA/ARS ABCL quarantine in Brisbane Australia for biology and host range evaluations. • Locate populations of Sternuchopsis reticulatus for collection and colonization.
Quarantine research at the USDA/ARS Australian Biological Control Laboratory (ABCL) was reinitiated after permits to import insects into Australia were reissued. Exploratory field surveys in 2012/2013 continued in mainland China, Hong Kong and Thailand to locate biological control agents of Rhodomyrtus tomentosa. Surveys focused on at least two stem-boring moth species which have been collected in Hong Kong and mainland China. A specimen from Hong Kong emerged and was identified as a Cossidae moth. After many years, the tip boring weevil Sternuchopsis reticulatus was recollected from Thailand and hand carried to quarantine at ABCL in Brisbane where staff are attempting to establish a colony. Tip-boring Lepidoptera were imported into Australia from Thailand in December 2012 and again in May 2013. Larvae were Metharmostis multilineata and Idiophantis soreuta. Metharmostis multilineata has already been rejected as a biological control agent given lack of specificity. Adults of I. soreuta emerged in ABCL quarantine and colony establishment is being attempted. Various Lepidoptera defoliators, binders and leaf miners were shipped and hand carried to IPRL quarantine in Fort Lauderdale.