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Allelopathic effects of Cyperus rotundus extract in vitro and ex vitro on banana

100%

Singh N. B. , Pandey B. N. , Singh A.

Acta Physiologiae Plantarum

2009

tom 31

nr 3

Allelopathic effects of Cyperus rotundus on banana ‘Grande Naine’ were studied in vitro as well as ex vitro. To study the allelopathic effects in vitro, the Cyperus extract was added to the multiplication medium during preparation before adjusting the pH. Of the four concentrations, 0.2 and 0.6% decreased the shoot multiplication and shoot length but 1 and 2% extract completely inhibited the shoot multiplication but induced rooting in 50 and 28% shoots, respectively. For the ex vitro studies, the Cyperus extract was added to the hydroponic medium during the hardening of in vitro raised banana plantlets. The extract of 1 and 2% concentrations decreased the shoot and root length, number of leaves and new roots, fresh weight, total chlorophyll and protein. The fluorescence intensity ratio was successively increased resulting in decreased photosynthesis.

Efficiency of botanical extract against maize weevil Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae)

88%

Khanal S. , Adhikari A. , Tiwari A. , Singh N. B. , Subedi R.

World News of Natural Sciences

2019

tom 24

With the objective of studying the efficiency of locally available botanical extract on maize weevil, a lab experiment was conducted from Feb 3 to Feb 20 2017, at the entomology lab of Gokuleshwor Agriculture and Animal Science College, Gokuleshwor, Baitadi. The design setup was that of a completely randomized design, with 10 treatments, each treatment was replicated thrice. Two varieties of maize local and a commercial hybrid were treated with five locally available botanical extracts, i.e. Acorous, Rittha, Neem, Asuro and wood ash to examine the efficiency of these on maize weevil. One kilogram of maize grains adjusted to 14% MC was placed in 20 cm high × 8 cm diameter plastic buckets. 10 gram of the powdered botanical pesticides of each of the test materials was then thoroughly mixed with the grains in each bucket. The mortality rate was recorded at 24 hours interval. Herein, Acorous showed the highest mortality rate in both local and hybrid varieties. The order of efficiency was found to Bhojo, Ritha, Ash, Neem and Asuro.