The Resistance Of Cotton Against Sucking Insect Pests Biology Essay

Cotton plays a critical function in Pakistan ‘s economic system. It is impaired by the job of low output due to assail of insect plagues. Among them the sucking insect plagues are the cardinal factors which cause maximal harm. The cultivation of immune cotton cultivars is an effectual and sound scheme used to take down the population of sucking insect plague. The present survey will be conducted to measure 10 cotton cultivars against sucking insect plagues at College of Agriculture D.G Khan. Seeds of 10 varities of cotton viz.Anmol, FH-113, FH-901, BH-160, CIM554, CIM-538, CIM-506, CIM-496, NIBGE-2, NIAB-111 will be sown during first hebdomad of May 2009. Experiment will be laid out in Randomized Complete Block Design with three reproductions. Data sing sucking insect plague will be recorded hebdomadal. Data collected and will be analysed statistically by utilizing a statistical plan MSTATC. Difference in intervention agencies will be compared by utilizing Duncan ‘s Multiple Range ( DMR ) trial at 5 % chance degree.


Cotton is the universe major fibre harvest and life blood of Pakistan ‘s economic system. Pakistan is the

fifth largest manufacturer of cotton in the universe, the 3rd largest exporter of natural cotton, the 4th largest consumer of cotton, and the largest exporter of cotton narration. 1.3 million husbandmans ( out of a sum of 5 million ) cultivate cotton over 3 million hectares, covering 15 per cent of the arable country in the state, cotton and cotton merchandises account about 2.4 per centum to GDP and 55 per cent to the foreign exchange net incomes of the state. Taken as a whole between 30 and 40 per cent of the cotton ends up as domestic ingestion of concluding merchandise, The staying is exported as natural cotton, narration, fabric and garments ( GOP, 2008 ) .

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!

order now

In the context of Muslim universe, 29 states produce cotton. Among these, Pakistan is the individual largest state accounting for 32 per centum of the corporate cotton land area, 30 per centum of production and 41 per centum of ingestion during 2006-07. ( GOP, 2007 ) .

Cotton plays a critical function in the economic system of our state ( Soomro, 2000 ) .

Cotton harvest is easy damaged by insect plagues, so cotton agriculturists are looking for ways to protect their harvests. Among serious sucking plagues like jassaid, aphid, white fly, thrips, touchs and an emerging job of mealy bug ( Khaskheli, 2006 ) are of import. Plant protection plays a really important function in the successful production of cotton harvest. The indiscriminate utilizations of insect powder for control of insects create job of environmental pollution and development of insect immune population. To cut down the job associated with the maltreatment pesticides in agribusiness different alternate methods of pest suppression are being tested in the different parts of the universe. To utilize immune assortment is one of the of import options.

In order avoid wholly dependance on insect powders, usage of varietal opposition against insect plagues is executable and its effectual application in incorporate insect plague control to avoid side consequence of pesticide usage, peculiarly the development of opposition in insects against insect powders. The chief aim of the present research work will be to happen out the response of different cotton cultivars to sucking insect plagues. Damage by sucking insect plague will besides be measured to all cotton truths under the agro- ecological status of D.G. Khan.


Amjad ( 1996 ) studied the opposition of five cultivars of cotton against sucking insect plagues and found that FH-63 was most immune.

Whala et Al. ( 1998 ) studied the comparative opposition of cotton cultivars and found that cultivars varied non merely with mention to insect plague composite, but besides with its constituents species. In general nevertheless, LDS-170 was found to be more immune to insect plague composite every bit good as the aphid where as was found to be most immune non merely to jassid and whitefly but besides to the pink and spotted bollworms.

Hassan et Al. ( 1999 ) reported the opposition of five cotton cultivars against sucking insect plagues. They reported that negative correlativity ( -0.94 ) was established between jassid onslaught and positive correlativity ( 0.93 ) between whitefly population and leaf hair denseness was observed.

Afzal et Al. ( 1999 ) tested opposition of 20 cotton cultivars against whitefly ( Bemisia tabacii ) and reported that the comparative opposition against whitefly varied with genotype.

Ali et Al. ( 1999 ) observed the opposition of 9 genotype of cotton against sucking insect plagues and reported that important differences were found among genotype sing all parametric quantities except whitefly and thrips population. A negative correlativity was found between hair denseness on leaf lamina and jassid population.

Aheer et Al. ( 1999 ) resulted 9 genotypes of cotton for their comparative opposition against sucking insect plague. They found a important difference among genotype sing all parametric quantities. N-86-Pb, N-92 and BH-99 showed highest per leaf population of jassid whitefly and thrips, and lowest population on N-92, BH-86 and MNH-329.

Raza et Al. ( 2000 ) found that 10 genotype of cotton viz.CIM-443, FH-634, HR-107, HR-102, HR-103, HR-VOL, FH-900, MNH-552, HR-107, NH and HR-101 and found that all the genotypes exhibited extremely important differences against sucking insect plagues population.

Bashir et Al. ( 2001 ) tested cotton genotypes viz.HR-109, HR-127, HR-129, HR-138, Brown, Gren, VO-MS, NIAB Krishma and CIM-448 and found that all the genotype exhibited extremely important differences against sucking insect population.

Shad et Al. ( 2001 ) studied the comparative response of five cultivars of cotton ( NIAB- Krishma, CIM -443, CIM-448, BH-36, FH-634 ) to sucking insect plagues. The lowest average population of thrips, jassid and aphid was 0.74, 0.13 & A ; 0.14 per foliage severally. The jassid population was close to ETL ( 1-2 jassid per foliage ) in August. The maximal population of aphid was 2.92 on NIAB Krishma. All the tried assortments, nevertheless found to be extremely susceptible to whitefly.

Arif et Al. ( 2004 ) studied the function of some morphological workss traits in assorted genotypes of cotton viz. , CIM-109, Cyto-9/91, FH-900, FH-901, FH-925, IRCIM-448, IRFH-901, NIAB Karishma, VH-137 and VH-142 in developing opposition against thrips, ( Thrips tabaci Lind. ) The consequences revealed that CIM-109 was relatively susceptible to thrips population while Cyto-9/91 was immune.

Ahmad et Al. ( 2005 ) catalogued 10 genotypes of cotton viz. , BH-118, CIM-443, CIM-448, FH-634, FH87, HR-129, VH-142, SLS-1, HRVO and Okra-170 in relation to resistance against jassid, ( Amrasca devastans Dist. ) . All the tried genotypes of cotton significantly differed in relation to all morphological works traits. From 10 genotypes, Okra-170 afforded appreciable opposition and was found relatively the most immune genotype to jassid onslaught. While FH-634 showed the highest susceptibleness to adult jassid. While maximal nymph population was noticed on FH-634 and lower limit on HRVO and same is the instance with grownup + nymph population. The last two hebdomads of August and foremost two hebdomads of September were found to be the most favorable for the development of jassid nymph and grownup population.

Iqbal et Al. ( 2008 ) conducted a survey for preliminary testing test of 30 genotypes of okra for comparative susceptibility/resistance against jassid, Amrasca biguttula biguttula ( Ishida ) during 2006. From these testing tests 3 genotypes demoing relatively susceptible ( Pusa sawani, Dera local and Okra-3 ) , 3 with intermediate ( Karam-5, Sabz pari and Clean spineless ) while 3 with resistant ( Makhmali, Punjab choice and Green admiration ) responses against jassid were selected for concluding showing test during 2007. Differences were found to be important among genotypes of okra during both the survey old ages. The tendency in selected genotypes towards susceptibility/resistance against jassid was similar to that observed during preliminary testing test. Pusa sawani showed maximal Host Plant Susceptibility Indices ( HPSI ) i.e. 18 % and was susceptible, while Green admiration was relatively immune with minimal HPSI i.e. , 5 % .

Paras et Al. ( 2000 ) studied HS-6 and six genotype of cotton ( G.arboreum ) .They reported that American cotton ( G.hirstum ) HS-6 was more susceptible to sucking insect plague and bollworm so G.arborium genotype of the cotton.


A field test will be conducted at college of Agriculture. D.G. Khan during 2009 to measure the public presentation of different cotton cultivars against sucking insect plagues. Ten cotton cultivars viz. Anmol, FH-113. FH-901, BH-160, CIM-554, CIM-538, CIM-506, CIM-496, NIBGE-2, NIAB-111 will be used as experimental stuff. Experiment will be laid out in Randomized Complete Block Design ( RCBD ) holding three reproductions and 10 treatment.Net secret plan size will be 12A-40 M2. All Agronomic patterns will be kept normal and unvarying for all the interventions from seeding to concluding picking. The information of pest population will be taken on hebdomadal footing. Five workss will be selected at random from each row. For entering the pest population, three foliages, one each from, top, in-between and bottom part of each works, will be selected. At the terminal all observation will be analyzed statistically on micro computing machine package MSTATC ( Anonymous, 1986 ) for rating of cultivars to sucking insect plague composite as an indirect contemplation of pest population. The intervention means will be compared by utilizing Duncan ‘s Multiple Range ( DMR ) test 5 % chance degree.