Abstract
White-backed planthopper, Sogatella furcifera Horváth (Hemiptera: Delphacidae) is a migratory and serious pest of rice crop worldwide including Pakistan. The current experiment was carried out to assess the antixenosis and antibiosis level of fifteen rice genotypes against S. furcifera under greenhouse conditions. In antixenosis studies, proportion of nymphs and adults settled was recorded in relation to control. Less preferred varieties by nymphs were RPP49 (3.80), N22 (5.60), IR 64 (6.20), IR 72 (6.60), Basmati Pak (6129) (5.40), and Super Basmati (5.00) as compared to TN1 (12.00). Lower number of eggs were laid on RPP49, N22, IR 64, Super Basmati and PKBB 8. Based on feeding marks the genotypes ranked from highest to lowest as RPP49, N22, IR 64, IR 72 and Basmati Pak. In antibiosis tests, RPP49, N22, IR64, IR 72, Super Basmati and Basmati Pak varieties performed well as compared to TN1. Minimum feeding rate (47.8 mm2) was recorded on RPP49 followed by N22, IR 64, IR74, Basmati Pak, Super Basmati, PKBB 8, PK 10684 and PK 10436 as compared to TN1(470.8 mm2). The results revealed that RPP49 emerged as the new resistant source against S. furcifera. Super Basmati, Basmati Pak have shown a moderate level of resistance while PKBB 8, PK 10684 and PK 10436 are new varieties with a moderate level of resistance to S. furcifera which can be used as resistance source in breeding programs against S. furcifera.
Highlights
Rice (Oryza sativa L.) is considered one of the major staple foods and is extensively cultivated on diverse ecosystems of tropical and sub-tropical regions of the world
The results revealed that RPP49 emerged as the new resistant source against S. furcifera
Thorough screening of resistance in rice germplasms is essential for the detection and deployment of resistant genes against plant hoppers (Horgan et al, 2015)
Summary
Rice (Oryza sativa L.) is considered one of the major staple foods and is extensively cultivated on diverse ecosystems of tropical and sub-tropical regions of the world. Whitebacked planthopper (S. furcifera), is a migratory and major delphacid hopper that attacks O. sativa L. in tropical Asia (Matsumura et al, 2009) First outbreak of this pest was recorded in 1980’s in the southern region of Pakistan on semi dwarf varieties and the yield loss estimated was of about 60% (Mahar et al, 1978; Majid et al, 1979; Ghauri, 1979; Rehman et al, 1986); so, Punjab is the major rice growing province in Pakistan, where the yield damages may be up to 7-10% annually. Keeping in view these considerations, present experiments were conducted to study their antibiosis and antixenosis levels in different rice genotypes against S. furcifera
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