Publication: Incidence and control of APHID - transmitted viral disease of Capsicum annum as effected by different weather conditions
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Date
2005-03
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Don Mariano Marcos Memorial State University - South La Union Campus
Abstract
This study was conducted mainly to find out the incidence of aphid
- transmitted virus disease of sweet pepper, and to test the effectiveness
of systemic and non - systemic insecticide and the use of net as plant
covering in preventing or controlling the incidence of the disease. This
study was conducted in Dungon Camp I, Tuba Benguet, from March
2004 to November 2004
The Randomized Complete Block Design (RCBD) was employed in
this study. There were four treatments replicated three times, which were .
as follows: To (Control) - no net; no insecticide; TI - use of fine net as
plant covering; T2 - use of non - systemic insecticide; and T3 - use of
systemic insecticide. The experiment was conducted twice, first time
during the dry season and the second during the rainy season.
Virus disease incidence as assessed by counting the number of
plants infected by virus sixty and ninety days after transplanting, and by
recording the yield in terms of number and weight of marketable fruits.
The highest number of virus - infected plants in both sixty and
ninety days after transplanting observed from To (no net, no insecticide)
while the least was observed in Tl (Plants covered with net).
On the other hand, the highest number of marketable fruits was
obtained from T1 while the least from To. Likewise, Tl outyielded all other
treatments in terms of weight of marketable fruits, while the lowest was
recorded from T0.
The incidence of aphid - transmitted virus disease was greatly
affected by the different planting seasons. The disease was observed to
have higher incidence during the dry than the rainy season.
The combined means of both. seasons of all treatments in all
observations show that Tl (plants covered with fine net) was the most
effective method in controlling the incidence of the virus disease. The
used of either systemic or non-systemic insecticide was proven to be a
useless endeavor.
The Nicotiana tabacum_cv. White Burley used as an indicator plant
in the Sap Transmission Test, developed clear manifestations of
symptoms which proved that the suspected virus disease that infected
the plants was really caused by virus.
The yield in terms of number and weight of fruits of sweet pepper
was greatly influenced by the incidence of the aphid - transmitted viral
disease. The higher the incidence of the disease, the lower the yield of
sweet pepper.
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Citation
Ducusin, M. J. S. & Caliging, V. B. (2005) Incidence and control of APHID - transmitted viral disease of Capsicum annum as effected by different weather conditions [Unpublished Undergraduate thesis]. Don Mariano Marcos Memorial State University - South La Union Campus, Agoo, La Union.