Impacts of horticultural mineral oils and two insecticide practices on population fluctuation of Diaphorina citri and spread of Huanglongbing in a citrus orchard in Sarawak.
Aspects of the incidence and spread of the citrus disease huanglongbing (HLB) in relation to the vector Diaphorina citri population fluctuation were studied from January 1999 to December 2001 seasons in a 0.8 ha citrus orchard at Jemukan (1° 33'N, 110° 41'E), Southwest Sarawak in Malaysia. In relation to insecticide and horticultural mineral oils (HMOs) use, levels of HLB infection rose quite rapidly over the next 3 years in the unsprayed control and less rapidly in the other treatments such as imidacloprid, nC24HMO, and triazophos/cypermethrin/chlorpyrifos. Levels of HLB as determined by Polymerase Chain Reaction (PCR) were 42.2%, 9.4%, 11.4%, and 22.7%, respectively. The effects of nC(24)HMO and conventional pesticides on the citrus psyllid population and parasitoids in citrus orchard were also determined.
Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Campus Bintulu Sarawak, Jalan Nyabau, 97008 Bintulu, Sarawak, Malaysia.
Stephen Chan Teck
SC
Leong
Fatimah
F
Abang
Andrew
A
Beattie
Roland Jui Heng
RJ
Kueh
Sing King
SK
Wong
D000818:Animals; D002957:Citrus / Q000187:drug effects / Q000254:growth & development* / Q000469:parasitology*; D006430:Hemiptera / Q000187:drug effects*; D007306:Insecticides / Q000008:administration & dosage*; D008899:Mineral Oil / Q000008:administration & dosage*; D010935:Plant Diseases / Q000469:parasitology* / Q000517:prevention & control*; D010938:Plant Oils / Q000008:administration & dosage
D007306:Insecticides; D010938:Plant Oils; D008899:Mineral Oil