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Study on Parthenogenesis in Study on Parthenogenesis in Cotton Mealy Bug Cotton Mealy Bug

((Phenacoccus solenopsisPhenacoccus solenopsis))

Presented by:Presented by:

Umair Faheem

M.Sc.(Hons.) Agri. Entomology

IPM Station (PARC), U.C.A., B.Z. UniIPM Station (PARC), U.C.A., B.Z. University, Multanversity, Multan

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IntroductionIntroduction::

Cotton mealy bug has emerged as one Cotton mealy bug has emerged as one of the most important pest of cotton of the most important pest of cotton and other plants of economic and other plants of economic importance.importance.

It is mainly controlled by the application It is mainly controlled by the application of insecticides which are highly toxic to of insecticides which are highly toxic to the non-target organisms.the non-target organisms.

There was a debate among the There was a debate among the scientists about the parthenogenesis in scientists about the parthenogenesis in mealy bug.mealy bug.

IPM Station (PARC), U.C.A., B.Z. UniIPM Station (PARC), U.C.A., B.Z. University, Multanversity, Multan

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ObjectiveObjectives:s:

Monitoring of parthenogenesis in Monitoring of parthenogenesis in cotton mealy bug on two different cotton mealy bug on two different hosts.hosts.

Effect of two different hosts on the Effect of two different hosts on the biology of cotton mealy bug.biology of cotton mealy bug.

IPM Station (PARC), U.C.A., B.Z. UniIPM Station (PARC), U.C.A., B.Z. University, Multanversity, Multan

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Materials and Materials and Methods:Methods:

HostsHosts– CottonCotton– China roseChina rose

Crawlers were reared individually leaves of Crawlers were reared individually leaves of each host in Petri dish containing moist each host in Petri dish containing moist filter paper at the bottom under control filter paper at the bottom under control conditions.conditions.

Insects were observed daily under Insects were observed daily under microscope.microscope.

IPM Station (PARC), U.C.A., B.Z. UniIPM Station (PARC), U.C.A., B.Z. University, Multanversity, Multan

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Materials and Materials and Methods-II:Methods-II:

Data of longevity, Sex ratio and Data of longevity, Sex ratio and fertility was taken after 24 hrs fertility was taken after 24 hrs interval.interval.

Half of the 3Half of the 3rdrd instar females were instar females were provided males.provided males.

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Providing moisture to avoid leaf desiccation

Cotton mealy bug pupae on China rose leaf

Petri dishes having crawlers of mealy bug

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Results and Results and Discussion:Discussion:

EggEgg11stst

InstarInstar22ndnd

InstarInstar33rdrd

InstarInstarPupaePupae

AdultAdult

MaleMaleTotalTotal

CottoCottonn

Fertilized Fertilized FemaleFemale

1.92 b1.92 b 5.34 a5.34 a 5.69 5.69 bb

25.44 25.44 aa

-- --38.39 38.39

aa

Unfertilized Unfertilized FemaleFemale

-- 4.69 c4.69 c 6.86 6.86 aa

20.46 20.46 bb

-- --33.90 33.90

bb

MaleMale 2.01 2.01 abab 5.22 a5.22 a 5.54 c5.54 c --

6.96 6.96 nsns

2.11 2.11 nsns

21.84 21.84 cc

ChinaChina

RoseRose

Fertilized Fertilized FemaleFemale

1.79 c1.79 c 5.14 5.14 abab

5.42 5.42 dd

21.35 21.35 bb

-- --33.70 33.70

bb

Unfertilized Unfertilized FemaleFemale

-- 4.62 c4.62 c 6.75 6.75 aa

19.25 19.25 bb

-- --32.74 32.74

bb

MaleMale 2.06 a2.06 a 5.14 5.14 abab

5.76 5.76 bb

--6.45 6.45 nsns

2.42 2.42 nsns

21.83 21.83 cc

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53

4247

58

0

10

20

30

40

50

60

70

Cotton China rose

MaleFemale

312

367

0

50

100

150

200

250

300

350

400

450

Cotton China Rose

Fertilized

Unfertilized

Results and Discussion-I:Results and Discussion-I:

Sex Ratio

nil

nil

Fecundity

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Conclusion:Conclusion:

There is no parthenogenesis in There is no parthenogenesis in Cotton mealy bug.Cotton mealy bug.

Experimentation is needed on male Experimentation is needed on male capturing techniques of Cotton mealy capturing techniques of Cotton mealy bug for its environment friendly bug for its environment friendly management.management.

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