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CTV is a phloem-limited single stranded RNA virus that produces large numbers of dsRNA replicative forms in the phloem sieve elements and companion cells of citrus plants. An infectious non-pathogenic CTV strain was engineered to produce dsRNA complementary to an essential ACP gene, target gene sequence 1 (TG1), and used to infect Citrus macrophylla. Following infection, cuttings were analyzed showing that the phloem contained many copies of ssRNA and dsRNA TG1 fragments. The number of TG1 sequences varied between individual leaves of infected plants. The younger flush stages, preferred by ACP, had the highest TG1 sequences. Feeding CTV/TG1 infected ACP plants caused 70% mortality suggesting a correlation between dsRNA copies and ACP mortality. Oviposition activity however was not affected. This research therefore, presents evidence that ACP mortality can be induced through oral uptake of dsRNA targeting specific ACP mRNAs and thus blocking the spread of citrus greening disease.
Human economic activity is considered to be an important factor in exacerbating the speed of invasive species spread, but may also play an important role in preventing it. In this study, we investigate the role of home foreclosure in the spread of Asian Citrus Psyllid (ACP, Diaphorina citri Kuwayama) throughout residential areas of Southern California. We find that foreclosures are indeed a significant factor in explaining ACP spread, even after controlling for other human and environmental effects. Our results suggest that human economic activity may be more important in controlling the spread of invasive species than previously realized, and that the external costs of the foreclosure problem may also be underestimated.
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This book, written by a team of experts on the Asian citrus psyllid, gathers together everything currently known about the biology and ecology of this important pest species, examines the transmission and acquisition processes of the pathogen, and looks at current management practices and their effectiveness. The potential for new, innovative management techniques are also described, along with the economic implications of managing this rapidly establishing disease.
This text presents an up-to-date account of the soft-scale insects, "Coccidae", and covers almost the entire spectrum of the knowledge of this insect family. It is divided into three sections, covering: soft scale insects; their natural enemies; and damage and control.
Plant hosts, life cycle, crop damage, and pest management information for this pest of citrus and other closely related plants.