Transmission and Pattern of Spread of Chilli Veinal Mottle Virus by Aphis Gossypii Glover (Homoptera: Aphididae)
Chilli veinal mottle virus (CVMV) is a serious problem and has become a major limiting factor in growing and production of chilli in Malaysia. This virus is transmitted non-persistently by aphid, Aphis gossypii. CVMV control efforts have been unsuccessful due to lack of knowledge on the epidemio...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1992
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/8568/1/FSAS_1992_4_A.pdf |
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| Summary: | Chilli veinal mottle virus (CVMV) is a serious problem and has
become a major limiting factor in growing and production of chilli in
Malaysia. This virus is transmitted non-persistently by aphid, Aphis
gossypii. CVMV control efforts have been unsuccessful due to lack of
knowledge on the epidemiology of the virus.
S tudies on transmission and spread of CVMV to chilli using
nymphs and adults of A. gossypii were conducted in the laboratory and
glasshouse. Aphids and test plants (Capsicum annuumcv. Me 4) were A single A . gossypii was abl e to transmit and r e tain CVMV
regardless whether it was fed or starved. A. gossypii lost CVMV infectivity
more rapidly in serial transfer (when feeding) than in post- acquisition
starvation (when starving). Transmission level decreased as the period of
serial transfer (0-60 min) and post-acquisition starvation time (1-120 min)
increased, however, the level of transmission increased with aphid
density.
cultured and maintained in insect proof glasshouse.
Fifteen seconds and thirty seconds acquisition feeding time were
found to be the optimum time for A. gossypii to transmit CVMV. All
aphid forms were equally efficient in CVMV transmission.Colony establishment of A. gossypii was faster when aphids were
initially released on healthy plants than on CVMV infected plants.
Apterous vectors spread CVMV more efficiently than alate vectors.
However, CVMV s pread faster when A. gossypii was placed on the
inoculum source. Apterous adults released near the inoculum source
achieved the highest level of transmission compared with the alates. In the
beginning, CVMV spread occurred mostly near the inoculum source and
moved outward thereafter. |
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