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20131
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Subject: Entomology × Author: Jawala Jindal × End date: 2013 × Start date: 2011 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Incidence of insect pests and management of shoot fly, Atherigona spp. in spring sown maize.
    (PAU Ludhiana, 2013) Jawala Jindal; Dulcha S., Brar
    The studies on the incidence of insect pests and management of shoot fly, Atherigona spp. in spring sown maize were conducted during 2011 and 2012 in the Punjab. At Ludhiana and Hoshiarpur, shoot fly was recorded as the key pest of this crop, while the incidence of other insect pests of maize was of minor importance. At Ludhiana, the small brown planthopper, Laodelphax striatellus (Fallén) was observed for the first time on the crop and its highest counts were observed in 3rd (96.06 to 186.08/ sweep) in 2011 and 4th week of April (0.16 to 1.49/ plant) in 2012. The predatory coccinellids were also observed in correspondence to the higher population of L. striatellus during 2011. The maximum egg counts of Atherigona spp. were observed at 10 DAG (0.19 to 0.52 eggs/ plant ) in 2011 and at 17, 7 and 12 DAG (0.15 to 0.79 eggs/ plant ) in end January, mid and end February sown crops, respectively during 2012. The deadhearts due to shoot fly damage were more in end February (11.58 & 17.72 %) followed by mid February (9.73 & 16.85 %) and least in end January sown crop (5.79 & 8.98 %) with grain yield loss of 27.93 & 37.97, 38.21 & 38.66; and 38.99 & 45.04 per cent, respectively during 2011 and 2012. Based on deadhearts incidence, the genotypes JH 3459 (10.49 %) & JH 3956 (10.95 %); CM 143 (15.16 %), PMH 1 (15.35 %) & JH 31244 (16.70 %); and LM 16 (21.48 %), PMH 2 (21.52 %) & Parkash (23.57 %) were found to be least, intermediate and highly susceptible to shoot fly, Atherigona naqvii Steyskal. The proportion of deadhearts out of total shoot fly incidence was minimum in JH 3459 & JH 3956.Whereas LM 16, PMH 2 & Parkash had lower larval & pupal periods; and higher larval survival, male & female pupal weight & fecundity. Thus, revealed the presence of tolerance and antibiosis mechanism of plant resistance in test genotypes against A. naqvii. The more leaf length, leaf width, stem girth and reducing sugars content were found related to susceptibility in the test genotypes and thus, could be useful in screening of maize germplasms against A. naqvii. The seed treatment with imidacloprid 600 FS @ 6 ml/ kg seed was found to be highly effective for the management of shoot fly in the spring sown maize.