RDE Abstract of Completed Research
Sugarcane Pests / Locusts
- Effect of simulated multiple
defoliation by locusts on the growth and yields of sugarcane
(2003)
- Angestal Vitug and
Marcelino Guevarra
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- Simulated multiple defoliation of sugarcane
by locust was evaluated to establish its effects on growth and
yields of sugarcane.
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- There was significant interaction between
level of leaf damage and frequency of defoliation on plant height
of 5- and 7-month old canes defoliated twice at 3-4 and 4-5 months
after planting and thrice at 3, 4 and 5 months age of the crop.
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- Differences on stalk diameter, cane weight,
TC/ha and Lkg/ha yields at varying levels of defoliation were
statistically significant. Cane plants totally defoliated at
ages 3, 4 and 5 months had the highest reduction in yield parameters.
- Yield loss assessment due to
locust through simulated damage on sugarcane (2000)
- Angestal Vitug and
Marcelino Guevarra
-
- Simulated multiple defoliation of sugarcane
by locust was evaluated to establish its effect on growth and
yield.
- There was a significant interaction between
the level of leaf damage and frequency of defoliation on height
of tillers of both five and seven months old canes.
-
- Stalk diameter and weight, TC/ha and Lkg/ha
of canes with multiple defoliations were significantly different
at varying levels of leaf damage. Plant canes totally defoliated
thrice at 3, 4 and 5 MAP showed the highest reduction in stalk
diameter and weight, TC/ha and Lkg/ha yields.
- Bio-efficacy of Metarrhizium
anisopliae (Mestch.) Sorokin against the oriental migratory locust
(Locusta migratoria manilensis Meyen) (2000)
- Juliet Recuenco
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- Inoculating hoppers with M. anisopliae by
spraying infected all instars of the locust hoppers. The older
the hoppers, the earlier and higher was the infection andpercent
mortality.
-
- Infection of hoppers and adults was significantly
greater at higher inoculum density (108 conidia/ml) than at lower
inoculum density (104 conidia/ml).
-
- Infested males showed highly significant
differences in percent mortality. Five to 12 days after inoculation,
percent mortality was higher than those inoculated with 1:1 male
to female ratio and higher percent mortality (87.5%) than those
inoculated with 1.5 male to female ratio (68.75%).
- There were significant differences in percent
mortality when adult locusts were inoculated. M. anisopliae -
infected males gave faster infection than the M. anisopliae -
inoculated rice hull.
- Insecticidal properties of
seven indigenous plants on the oriental migratory locust on sugarcane
(1998)
- Juliet Recuenco
-
- The bioefficacy of Azadirachta indica, Andrographis
paniculata, Tagetes erecta, Blumea balsamifera, Gliricidia sepium,
Cantharanthus roseus and Coleus amboinicus was tested on the
oriental migratory locust, Locusta migratoria manilensis on sugarcane.
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- A. indica, A. paniculata, C. amboinicus and
G. sepium showed growth inhibitory, repellent, eradicative and
protective properties against locust. Nymphs reared on A. indica
treated sugarcane leaves failed to develop into adults and had
100% mortality seven days after treatment. Locusts grown on A.
panicutara, C. amboinicus and G. sepium were smaller and lighter
with prolonged nymphal development and had lower growth index
than those grown on T. erecta, B. balsamifera and C. roseus extracts.
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- In free and no-choice tests, neem, kakawate,
serpentina and oregano consistently exhibited anti-feedant activities
against the nymphs and flyers.
- Surveillance, monitoring and
control of locust on sugarcane (1997)
- Reynaldo Sampang,
Agnes Casupanan and Lucia Lagman
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- The study was carried out in Pasudeco, Pasumil
and Tarlac mill districts from January 1995 to March 1997. The
approximate area of sugarcane infested with locust in 1995 was
1,663.03 ha. and 1,400.88 ha. in 1996. There was a general decline
of the insect pest population from 1995 to1996. Locust infested
the sugarcane crops during elongation stage or at 4-7 months
old. The study provides information on the location of the insect
pest, assessment of damage and other data needed to and control
this pest.
- Biology and behavior of the
oriental migratory locust, Locusta migratoria manilensis Meyen
on sugarcane (1997)
- Juliet Recuenco
-
- The biology, behavior and occurrence of the
oriental migratory locust were studied using sugarcane leaves
of Phil 7228 as host plant. The eggs were laid in egg pods of
about 2 cm. long below the soil surface at 5 to 10 cm. depth.
They were clear yellow, slightly curved, sausage-shaped, 6 mm.
long, covered with frothy material and hatched in 14 to 25 days.
The total developmental period (from egg to adult emergence)
ranged from 46 to 71 days.
-
- There were five nymphal instars and each
stage lasted from 5 to 9 days for the first and fifth instars,
respectively. The adult locust lived for 69 to 113 days with
an average of 88 days. Of the 240 nymphs reared, 122 reached
adult stage with a total mortality of 50.83%. During the crop
year 1994-95, L. m. manilensis was observed infesting sugarcane
in great numbers at different stages of growth of sugarcane in
PASUDECO and PASUMIL mill districts. Only PASUMIL mill district
was infested with a minimal area for crop year 1995-1996.
- Three species of ants, bull frogs and birds
were observed preying on the nymphs and flyers. Locust fed on
sugarcane, rice, corn, talahib and bamboo.
- Control of migratory locust
on sugarcane through selected insecticides and bait materials
(1995)
- Juliet Recuenco,
Angestal Vitug, Reynaldo Sampang, Agnes Casupanan and Alicia
Burcer
-
- Ten commercial available insecticides were
tested in the laboratory and field against the destructive locust
flyers and hoppers (Locusta migratoria manilensis Meyen) as spray
and bait applications. Eight of these, namely: Hopcin, Cymbush,
Decis R, Fenom D 225, Sevin, Polytrin C, Trebon and Basudin,
exceeded the 90% level of mortality one hour after spray application
on locust flyers but only two of them, Cymbush and Hopcin, exceeded
the 50% level or mortality three hours after spraying locust
hoppers in the field.
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- Both bait materials, sugarcane bagasse and
rice hull treated with the ten insecticides, showed their efficiency
as carriers of the insecticides and effectively controlled the
locust hoppers significantly with 80 to 100% mortality.
