Effect of Different Nitrogen Regimes on Onion Thrips,Thrips tabaciLindemann, on Onions,Allium cepaL.

Studies on Reducing Thrips Populations in Onion by Optimizing Nitrogen and Potash Levels

“…Similarly, Malik et al, (2009) reported that yield of onion was increased with 200kg N/ha. Whereas, the highest bulb yield (19.50 t/ha) was recorded with a recommended doses of inorganic nutrients along with farm yard manure, bio-fertilizers, and neem cake (Bandi and Sivasubramanian, 2012).…”

“…Whereas, the highest bulb yield (19.50 t/ha) was recorded with a recommended doses of inorganic nutrients along with farm yard manure, bio-fertilizers, and neem cake (Bandi and Sivasubramanian, 2012). Patel and Patel (2012) suggested that the yield of onion bulb was significantly highest (60.74 t /ha) with 150 Kg N/ha, and it was at par with treatment of 100 kg N/ha which yielded 57.80 t /ha onion bulb as compared to 50 kg N/ha, However, Malik et al, (2009) suggested that a rapid decrease in the yield was obtained with 200-250 kg/ha, Table.1 Studies on reducing thrips populations in onion by optimizing nitrogen and potash levels (Pooled data 2014(Pooled data -15, 2015(Pooled data -16, 2016 …”

“…Recommended rate of N, P, and K, three times of the recommended rate of organic fertilizer, and control without fertilizer application were similar in relation to density of thrips (Goncalves and Sousa, 2004). Furthermore, six rates of N, low (50 kg N/ha) and optimum (150 kg N/ha) were applied to soil, but they did not affect on the abundance of T.tabaci on onions, although the density of thrips (7.6 thrips/plant) was decreased in 150kg N/ha (Malik et al, 2009). They also reported that a total of 13 thrips/plant were observed with application of higher rate of N (200 and 250 kg/ha), which increased the population of thrips up to73.90%.However, it is confirmed by Martin and Workman (2006) that agronomic and N-fertilizer factor affected the susceptibility of onion bulbs to onion thrips.…”

Soil conservation practices for insect pest management in highly disturbed agroecosystems – a review

“…Nitrogen levels appear to be especially important, which is not surprising as nitrogen is usually a limiting element for insect herbivores (Nicholls & Altieri, 2007). Malik et al (2009) reported nearly twice as many thrips on onions supplemented with 200 kg N ha À1 compared with 50-150 kg N ha À1 . Yet, excessive amounts of nitrogen fertilizer have been associated with greater pest and disease problems (Malik et al, 2009;Buckland et al, 2013).…”

Iris yellow spot virus (Tospovirus: Bunyaviridae): from obscurity to research priority

“…In the absence of any significant host plant resistance to IYSV, management options are currently centred around cultural or production practices, such as sanitation (removal of crop volunteers, better weed management), crop rotation, straw mulching, irrigation scheduling, avoidance of the green bridge by physical separation of bulb and seed crops, fertilizer management, especially for nitrogen (Buckland et al ., ; Larentzaki et al ., ; Malik et al ., ), and sound thrips control practices through the judicious use of reduced‐risk insecticides (Nault et al ., ). The use of straw mulch resulted in the reduction of thrips numbers by 30% (Schwartz et al ., ).…”