LIBRO-CONGRESO-CITRUS

S16
Suppression of citrus psyllid populations is recommended for slowing disease spread. The efficacy of the
Winner® (imidacloprid) by trunk application was tested against the citrus psyllid in plants with different ages.
This experiment was conducted in a citrus grove of different tree sizes in Bayer CropScience’s Experimental
Agricultural Station, Paulínia, SP, Brazil. The study block was divided into four replicates within which 7 treatments
were randomly assigned: (1 – 5) Winner 200 CS (Imidacloprid 200 g/L) at 0.2 g ai/cm trunk diameter in plants of
2, 5, 10, 15 and 20 cm diameter, (6) Winner 200 SC at 0.3 g ai/cm trunk diameter on 20 cm diameter plants, and
(7) a blank application as untreated control. Treatments were applied by a spray applicator with the full strength
product without water, around the whole diameter of the trunk 20 cm below the lowest branches. Psyllid adults
were confined by sleeve cages to plant shoots and the number of alive adults and nymphs inside the cages
were later counted to assess efficacy. The interval of the infestations was according the presence of new shoots.
Efficacy was calculated by the formula of Abbott and the data were transformed using the arcsine square root
functions and subjected to ANOVA and means compared using Tukey’s test (P < 0.05). -Control was 100% in
plants of 5 cm diameter but variable results against adults were seen on larger trees.- Nymphs controlled better
than adults regardless of tree size, with suppression observed up to 214 days.
S16P09
Movement of Asian citrus psyllids in HLB-affected and healthy citrus trees
Cen Y. 1 , Wu F. 1 , Liang G. 1 , Chen J. 2 , Deng X. 3 , and Xia Y. 4
1 Laboratory of Insect Ecology, South China Agricultural University, China; 2 Crop Diseases, Pests and Genetics Research, San Joaquin
Valley Agricultural Sciences Center, USDA, USA; 3 Citrus Huanglongbing Research Laboratory, South China Agricultural University,
China; and 4 Center for Integrated Pest Management, North Carolina State University, USA. cenyj@scau.edu.cn
Asian Citrus Psyllid (ACP) Diaphorina citri Kuwayama (Hemiptera: Psyllidae) is the vector of Huanglongbing (HLB).
Diaphorina citri showed different tropism to HLB-infected and healthy citrus trees. The presence or absence of
new flushes had a significant influence on the movement of ACP in HLB-affected citrus hosts. With new flushes,
HLB-affected citrus trees were more attractive to adults of ACP. The psyllids fed on the host for a longer time
period. In the absence of new flushes, psyllids preferred leaves with yellowing symptoms. After feeding for about
36 hours, psyllids moved to health-looking leaves. This behavior appeared to facilitate pathogen spread. In a color
board experiment (yellow, green or white), it was observed that the yellow color board attracted more adult
psyllids, indicating that psyllid adults preferred yellow color. Late stage psyllid nymphs (3rd to 5th instar) could
make significant horizontal and vertical movements. In HLB-affected trees, nymphs were more attracted towards
yellowing young shoots. Yet, movement was slower in HLB-affected trees than that in healthy trees. In healthy
trees, number of nymphs moving downwards was significantly higher than that in HLB-affected trees.
S16P10
Effectivity of Huanglongbing vector (Diaphorina citri kuw.) control citrus grower group based in
regency of Sambas, West Kalimantan, Indonesia
Supriyanto A.S. 1 , Nurhadi N. 1 , Zuhran Z. 2 , and Purbiati P. 3
1 Balai Penelitian Tanaman Jeruk dan Buah Subtropika (Balitjestro), Agriculture, Indonesia; 2 Balai Pengkajian Teknologi Pertanian
Kalimantan Barat (BPTP Kalbar), Agriculture, Indonesia; and 3 Balai Pengkajian Teknologi Pertanian Jawa Timur (BPTP Jatim), Agriculture,
Indonesia. arry_supriyanto@yahoo.com
The purpose of this study was to determine the effectiveness of Huanglongbing vector control recommendation
citrus grower group based. Studies have been carried out in 2010 in Tebas Sungai village, Sambas district, with
11 tangerine groves owned by growers in the citrus grower association of Sambas district. The tangerine
grove that been used are, one grower’s orchard as a demonstration plot in a particular citrus grower group
(orchard I); five other citrus orchards with different ownership at the same citrus grower group (orchard II),
as well as five other citrus orchard with different ownership which each of them spreads over five different
citrus grower groups outside the farm demonstration plots (orchard III). The recommendation technology
for controlling Huanglongbing vector which applied in this experiment, included bark painting by systemic
insecticide of imidacloprid for two each 1.5-month and spray using contact insecticide with dimethoate to
the plant crown which application time been alternated after bark painting application. The effectiveness of
technology implementation is measured by a decrease psyllid populations found in citrus samples in adult
286 - VALENCIA CONFERENCE CENTER, 18th-23rd NOVEMBER 2012