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Occurrence of Citrus Rind Borer and Other Arthropods on Pummelo

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Leslie Ubaub

on 5 October 2012

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Transcript of Occurrence of Citrus Rind Borer and Other Arthropods on Pummelo

Thank you! It appears that all fruits in one fruiting season could possibly be infested with CRB, without the intervention of any control measures.
Predators such as Salticid spider and a species of ants were found to prey on CRB prepupa in the field.
Several families of hymenopterans such as Chalcidoidae, Ichneumonidae and Formicidae were potential biocon agents. Conclusion: Results: there was no correlation between the number of larvae per fruit and time (in weeks) of sampling (r=0.323; P=0.142) Results: The number of CRB larvae per fruit counted from 7 DAFS to 35 DAFS follows a Poisson distribution.
The estimated highest possible number of larvae per fruit can be assumed to occur within 21, 28, and 35 DAFS with an average value of 8.2, 7.93 and 8.27, respectively while at 7 and 14 DAFS, the average value are 2.07 and 5.8 Results: 1. Total number of CRB adults collected
Sweep net method = 0
Light trap = 50 adults
2. Total number of CRB larvae counted
484 larvae of different instars Results: Distribution of the number of larvae per fruit is computed using Anderson Darling to test the goodness of fit.
Descriptive statistics was analyzed using EasyFit Software Professional 2004-2011 MathWave Technologies.
Simple correlation analysis using Pearson’s correlation coefficients in SAS v6.12. Collection Methods: 4. Sampling of Damaged Fruit
Newly formed flower buds were tagged.
15 fruits were collected and examined for CRB larva every sampling period.
From June 21 to November 10, 2010) for a total of 22 weeks observation. Collection Methods: 3. Visual Observation
Monitoring of the pummelo trees was done daily. Collection Methods: 2. Light Trapping
An improvised light trap composed of an ordinary 100-W incandescent white bulb, fabricated funnel and catching basin made up of tin sheet painted with white and rechargeable car battery. Collection Methods: 1. Sweep Net Sampling
A hundred sweeps per tree, at 25 sweeps per quarter of the canopy.
Weekly sampling (25 weeks) from May 29 to November 13, 2010 at 9:00 in the morning.
A complete enumeration of samples from the four selected trees was done. Collection Methods: 1. Sweep Net Sampling
2. Light Trapping
3. Visual Observation
4. Sampling of Damaged Fruit
5. Rearing of Field-collected CRB Eggs and Pupae for Emergence of Natural Enemies Collection Methods: 1. To determine the potential of CRB to cause economic damage.
2. To collect and determine other arthropods and identify their possible interaction with CRB. Objectives: Occurrence of Citrus Rind Borer and other
Arthropods on Pummelo

Leslie L. Toralba-Ubaub and Virginia R. Ocampo long neglected commodity
exploration of other control methods especially utilization of biological control agents. Gap: limited only to the use of insecticides and fruit bagging (DA BPI-DNCRDC, 2008). Control Methods: PiTrade-TADECO invests about Php 180, 000.00/ha. on production cost (Pangan et al. 2007). Fact: Citrus Rind Borer (CRB) Prays endolemma Diakonoff and other pests Problem: A total of 1,748 ha in Region XI
Total volume of 15, 824 metric tons Area planted to Pummelo: Citrus maxima [Burm] Merr.
the most important citrus cultivar grown in Region XI. Pummelo: Other arthropods observed: Results: Other arthropods observed: Results: 5 4 3 2 1 Methodology:
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