Abstract:The commercial value of banana is mainly affected by red rust thrips, Chaetanophothrips signipennis (Bagnall) during fruiting phase at maturity. In this context, the trial was framed at F.R.S., N.A.U., Gandevi under ICAR-AICRP (Fruits) programme. The three years data on efficacy of bio-rational pesticides for management of red rust thrips revealed that bud injection of imidacloprid (0.3 ml/ 500 ml water) @ 1 ml/bud exhibited lowest unblemished fruits up to 8.37% over conventional spraying (20.72%) and bunch sleeving method (42.83%). The comparable results on fruit damage (14.83%) was observed with bud injection of azadirachtin (1%) (5 ml/l water) @ 2 ml/bud over conventional spray. The merit of technology furnished higher no. of unblemished fruits (<10%) and original peel superficial appearance remains impassive under bud injection technique with higher benefit cost ratio with very low dose of pesticide provide financial profit to growers and traders. Besides, imidacloprid residue was not detected in harvested fruits and there is no other technology available to remove this malady of banana
An experiment laid down to evaluate the effect of biofertilizers, growth regulator gibbralic acid (GA3) and micronutrients on yield and yield attributes of Sapota cv. Kalipatti at Fruit Research Station, Navsari Agricultural University, Gandevi, Gujarat. The treatments of recommended dose of fertilizer (RDF), i.e.100 kg FYM and 1000:500:500 g/plant NPK along with application of biofertilizers (Azospirillum + PSB), growth regulator (GA3) and micronutrients. The pooled results of 75% RDF + biofertilizers- Azospirillum + PSB @ 40 ml/tree + GA3 @ 50 ppm + Grade 4 (micronutrient @ 0.5%) were exhibited significantly higher number of fruit (2815.45), yield (20.61 t/ha)along with net return (Rs. 3,03,951/ha) and Benefit Cost Ratio (2.81). The said application enhanced fruit yield up to 43.41% over control comprising RDF only. However, significantly higher fruit weight (81.34 g) was recorded in application of 100% RDF + biofertilizers- Azospirillum + PSB @ 40ml/tree + GA3 @ 50 ppm + Grade-4 (micronutrient @ 0.5%).
The effect of three commonly used water sanitizers, viz benzalkonium chloride (BKC), sodium hypochlorite and iodophor on shrimp pond associated microbiota was studied in laboratory microcosms. Treatment of microcosm with 0.1 ppm BKC did not lower the total heterotrophic bacterial count. With 3.0 ppm, there was an initial reduction of one log unit at 8h followed by an increase in bacterial counts at 18h. Ammonia oxidizers on the other hand were affected even with 0.1 ppm. Sodium hypochlorite at 10 ppm brought about one log reduction in heterotrophic bacterial count and the level of ammonia oxidizers was also reduced. Treatment with 10 ppm iodophor did not affect both autotrophic and heterotrophic bacteria. The results suggest that sanitizers should be used with caution in shrimp ponds due to their deleterious effect on useful microorganisms involved in mineralization.
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