TITLE

ACCELERATING INFESTATION OF PINK BOLL WORM PECTINOPHORA GOSSYPIELLA {SAUNDERS){LEPIDOPTERA: GELECHIIDAE) ON BT -VARIETIES OF COTTON IN PAKISTAN

AUTHOR(S)
ABBAS, GHULAM; FARHAN, MUHAMMAD; HAQ, IKRAMUL; GHOUSE, GHULAM
PUB. DATE
January 2015
SOURCE
Egyptian Journal of Agricultural Research;2015, Vol. 93 Issue 1(A), p205
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Cotton Gosspium hirsu' tum L. is most important cash crop of Pakistan and important trade commodity of the world because of its exportability as well necessary domestic use. The cotton growers have to combat with an insect pest complex using different IPM techniques for successful cotton production. This fight was facilitated when the Lepidopterous pests ie. bollworms of cotton were managed by use of transgenic resistant varieties commonly known as Bt varieties/cultivars which have been registered for general sowing or which are commonly available to some farmers for· sowing at his field. Use of these transgenic Bt cultivars has been so popular in farming community that area under these has rigorously increased, starting from nearly last 10 years, now Bt varieties have almost replaced the conventional non-Bt varieties (survey of >2000 farmers in district Lodhran). Bt cultivars worked satisfactorily for last many years except some limited and short duration problems of bollworms reported from different pockets, that were usually because of mixed seed. In last cotton season 2014, the infestation of pink bollworm Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae) intensified tremendously and it was reported from almost all the cotton growing tract of Punjab. Owing to these reports studies were carried out in 3 subdivisions of Lodhran from 10 different Bt-varieties of cotton sown in that subdivision. 50 bolls were plucked from all the fields at random in· the month of October, 2014. In total 1549 collected bolls were kept in paper bags for a week and then percentage of damaged bolls as well as number of live larvae were recorded from all samples. The results were alarming to note all of 17 cultivars collected for study were susceptible showing 24.49 % to 100 % infestation. The average intensity of alive larvae per boll was 109.6 % inside the infesteQ boll. The situation spells a serious threat and dem~nds the immediate attention of cotton growers, ' breeders, biotechnologists, seed prooucers, extension workers, entomologists and research workers.
ACCESSION #
110910127

 

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