LIBRO-CONGRESO-CITRUS

stage, nymphs and eggs that were observed at regular intervals every two weeks during the flushing to the
14th week after the first treatment. The results showed if the recommended treatment technology were
absolutely proven to reduce Huanglongbing vector population in significant, namely in the orchard I, II, and III
respectively at 95.3%, 84.7%, and 72% for stage imago; 97.3 %, 80%, and 100% for stage nymphs; and 98.5%,
100% and 100% for the egg stage.
S16P11
Behavioural responses of Diaphorina citri to host plant volatiles.
Fancelli M. 1 , Birkett M.A. 2 , Pickett J.A. 2 , Moraes M.C.B. 3 , Laumann R.A. 3 , and Borges M. 3
1 Embrapa Cassava & Fruits (EMBRAPA/CNPMF), Laboratory of Entomology, Brazil; 2 Rothamsted Research (RRES), Biological Chemistry
and Crop Protection, UK; and 3 Embrapa Genetic Resources & Biotechnology (EMBRAPA/CENARGEN), Laboratory of Semiochemicals,
Brazil. fancelli@cnpmf.embrapa.br
The Asian Citrus Psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae) is a vector of the greatest threat to the
citrus production and industry in the world known as HLB (Huanglongbing = ex-greening). Differences in host
plant suitability for insect development and disease incidence have been reported. Thus, D. citri responses to
plant volatiles were investigated in order to identify attractants from host plants. Volatiles were collected from
host plants, Citrus sinensis cv. Pera D6, C. reshni - Cleopatra, Citrus limettioides and Poncirus trifoliata. A four-arm
(Pettersson) olfactometer was used to determine behavioural responses of D. citri females to the volatiles. One
treated arm (plant volatiles) was compared against control arms (hexane). Air was drawn from the olfactometer
at the rate of 200 ml/min. One adult female starved for 1 h was exposed to the volatiles for 16 min, and every 2
min the position of the olfactometer was rotated by 90°. The time spent by D. citri in the different arms of the
olfactometer was recorded using OLFA software. The data were analysed using a two-sample unequal variance
t-test. D. citri spent more time (P< 0.01) in the arm treated with Citrus sinensis cv. Pera volatiles when compared
to control arms, but no differences between treatments and controls were observed for the other plants. These
data so far provide evidence for differences in susceptibility of potential host plants.
S16P12
Efficacy of selected insecticides for the control of the California Red Scale in Southern Italy.
Campolo O., Grande S.B., Chiera E., and Palmeri V.
University of Reggio Calabria (UNIRC), Department of Agricultural and Forest Systems Management, Italy. orlando.campolo@unirc.it
The California Red Scale (CRS), Aonidiella aurantii (Maskell), is considered one of the most important pests of
citrus in the Mediterranean basin as well as in other citrus growing areas worldwide. In Southern Italy, citrus
is the most widely cultivated crop and the control of the CRS relies mainly on the application of synthetic
insecticides. During 2009 and 2010, selected insecticides (spirotetramat, chlorpyriphos and pyriproxyfen) were
evaluated against this pest in two Calabrian citrus orchards under integrated pest management. Treatments
were performed according to the dosage reported on the label of the commercial products. Two treatments, at
15-day interval, were performed. Control plots were sprayed with water only. Efficacy was assessed 7, 14, 21,
and 28 days after the first treatment and at the harvest. In both trials, spirotetramat showed the highest levels of
efficacy against CRS and other citrus pests (citrus leafminer, aphids and mites) that were adequately controlled
until the harvest. At harvest, spirotetramat also had the best visual acceptance by a panel of consumers.
S16P13
Altea (Eastern Spain) area-wide project to control California Red Scale Aonidiella aurantii
(Hemiptera: Diaspididae) based on conservation and release biological control agents.
Laborda R. 1 , Garcia-Mari F. 2 , Sanchez A. 1 , Xamani P. 1 , Garcia A. 3 , Punset C. 4 , Bernabeu P. 5 , Aznar M. 5 , and Bertomeu S. 1
1 Universitat Politécnica de Valencia (UPV), Ecosistema Agroforestales, Spàin; 2 Universitat Politécnica de València (UPV), Instituto
Agroforestal Mediterráneo, Spain; 3 Universitat Politècnica de València (UPV), Hidráulica, Spain; 4 Ayuntamiento de Altea, Spain; and
5 Cooperativa Agrícola de Altea, Spain. rlaborda@eaf.upv.es
The municipality of Altea includes a large rural area in which citrus orchards and country cottages coexist. A
municipal initiative instituted to reduce the risk of pesticides used to control the principal pest of citrus crops
XII INTERNATIONAL CITRUS CONGRESS 2012 - 287
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