Corm Weevil

8/13/2019 Corm Weevil

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CORM WEEVIL TRAP INSTALLATION ANDPOPULATIONMONITORING AT TAGUM AGRICULTURALDEVELOPMENT COMPANY, INC. (TADECO),

BRGY. A.O. FLOIRENDO, PANABO CITY

GILBERT M. CALISTRAINEE


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MAJOR ACTIVITIES UNDERTAKEN

Corm weevil trap installation (Fig. 1)

Corm weevil, Cosmopolites sordidus(Germar) is one of the important pests of

Cavendish banana. This insect is nocturnallyactive and very susceptible to dessication. Adults live as 2 years and survive long withoutfood. The female oviposits its eggs singly intoholes made by the rostrum. The larvae are themost destructive stage of the corm weevil, theyfeed and burrow into the corm creating damage,

resulting to root destruction and tunneling of


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Corm weevil is a nocturnal insect thats

why trap was set-up in the field in order to

catch them. Installation of corm weevil trap

(split-log trap) was used to monitor the

population of this important pest of banana.


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Materials needed in corm weevilinstallation (Fig. 3)

PPE ( Personal Protective Equipment)Tumbling boloScabbard with disinfectantSticksRed strips


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Corm weevil population monitoring

Importance of corm weevil populationmonitoring

For informed population managementdecisions.

Insecticide treatments or mass trappingtechnique can be recommended when

counts exceed the action threshold. ( action


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OTHER ACTIVITIES UNDERTAKEN

Bud injection (Fig. 4)

Bud injection is used to control flowerthrips of banana that cause water soak andbrown scab. Damaged of thrips can affect thequality of fruits and if it is severely damage itwill cause wastage of production. This

method of control should do before the thripspopulation established inside the bud andproper compliance of standard operating

procedure (SOP) is important.


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Procedure for bud injection

Locate the mats to be injected.Calibrate the delivery rate of the spot gun (10ml/squeeze) each bud should receive 80 mlsolution.Clear the hock attached at the tip of the lance.Inject bud 6-8 inches from its tip at 45 degreeangle.Press spot guns trigger eight times (80 ml).Estimate 3-4 seconds before pulling out theneedle.


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Scale insect monitoring (Fig. 5)

Scale insect infestation was one of the

problems in banana plantation. Chemical is

used to control this pest by spraying the bunch,the lower leaves and pseudostem. Washing was

also used to clean the infested hands in the

packinghouse by means of pressurized water.

Population monitoring was used to monitor its

population by bunch reading.


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Scale insect population is rated by using thescale:

0 - none2 - moderate (1-2 fingers infested)

3 - severe (> 5 fingers infested)

Procedure for scale insect monitoring Monitor SI on 9weeks old on bunches.

Getting samples to the 1-2 leaf of mother andfollower plants.


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Thrips damaged assessment (Fig. 6)

Thrips damaged such as oviposition

damage, brown scab and water soaked

were assessed by reading the bunch, 9

weeks after bagging. Thrips damage was

rated using the following rating scale.


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Oviposition damage rating

0 - no oviposition damage in all fingers1 - with oviposition puncture of 1-5 inches in

majority of the fingers2 - with oviposition puncture of 6-10 inchesin majority of the fingers3 - with oviposition puncture of >10 inchesin majority of the fingers


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Brown scab and water soaked damagerating:

0 - no damage1 - water soaked lesion/corky scab present

from the crown to the neck or up to 1.5cm from the neck to finger.2 - water soaked lesion/corky scab morethan 1.5 cm from the neck to finger

3 - water soaked throughout the finger


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Production parameters (Fig. 7)

Production parameter was taken at harvest

to determined the bunch weight,

calibration/size of finger, finger length, and

number of hands.

Materials needed Round caliperFinger lengthWeighing scale


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Procedure for production parameters. Select 10 samples systematically.Get the hand class.Measure the middle outer whorl finger of thesecond basal hand-for calibration-for finger lengthGet the bunch weight.


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Banana root sampling (Fig. 8)

Root sampling was to assess the roothealth status of the area throughdetermination of percentage root lesion. Rootsampling was done by collecting rootsamples 2 inches away from the base andfacing between the mother plant and itsfollower. The dimension of the hole per

sampling mat (with mother plant and itsfollower) is 15 X 30. Plant height, girthdiameter are also gathered. Collect 6 sample

plants per lot and it will be process at the


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Root damage category:Functional roots

A - 0 to few small lesionB - many small lesions with 1 to 2 largelesions (5-10 mm)C - three to several large lesions affectingless than 50% of the root length

Non-functional rootsD - large coalescing lesions affecting 50-80% of lengthE - root length 95-100 % blackened


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Banana fruit waste evaluation

Fruit waste evaluation was a method to

evaluate the companys fruit waste. This was

done at packinghouse to separate damage

fruit like bruising, knife cut, maturity stain,

chemical burn, old scar and other fruits thatwere infected with diseases and infested with

pest. ( Fig. 9)


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Procedure for fruit waste evaluation Bunch weighingClassification of bananaStalk weighing


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DOCUMENTATIONS FROM

MAJOR ACTIVITIES UNDERTAKEN


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FIGURE 1. CORM WEEVILINSTALLATION


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FIGURE 2. CORM WEEVILDAMAGED

up-rooted plant tunneling of corm


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Figure 3. Materials needed in corm weevilinstallation


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DOCUMENTATIONS FROM

OTHER ACTIVITIES UNDERTAKEN


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FIGURE 4. ACTUAL BUDINJECTION


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FIGURE 5. SCALE INSECTMONITORING


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FIGURE 6. THRIPS DAMAGEASSESSMENT


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Figure 7. Production parameter

HAND CLASS BUNCH WEIGHT


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CALIBRATION/FINGER SIZE FINGER LENGHT


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FIGURE 8. BANANA ROOTSAMPLING


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FIGURE 9. BANANA FRUITWASTE

Corm Weevil

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