BPH control in rice || Rice disease management||Brown plant hopper control in paddy|| BPH of paddy
BPH infest the rice crop at all stages of plant growth. Due to feeding by both the nymphs and adults at the base of the tillers, plants turn yellow and dry up rapidly. During the early infestation stage, round yellow patches appear, which soon become brownish due to the drying up of the plants.#ringtone #tractors #farmingvideos #rice #paddy #paddy#tractors #tomato#farmingvideos #farm #agro #agriculture BPH[3] infest the rice crop at all stages of plant growth. Due to feeding by both the nymphs and adults at the base of the tillers, plants turn yellow and dry up rapidly. During the early infestation stage, round yellow patches appear, which soon become brownish due to the drying up of the plants. This condition is called 'hopper burn'. Temperature is a critical factor that affects the life activities of this insect. The hatchability and survival rate are the highest around 25 °C. The eggs are highly sensitive to desiccation and soon shrivel when the host plant starts wilting. BPH population growth is maximal in a temperature range from 28 to 30 °C[citation needed].Predators of this insect include the spiders Pardosa pseudoannulata and Araneus inustus.[4] In some cases, BPHs lay eggs in the rice seed beds (also known as rice nurseries) shortly before transplanting, so enter the field in this manner.[5]
Differential mortality of predators and hoppers does not appear to be the primary factor for insecticide-induced resurgence.[6] Some insecticides evidently increase the protein content of BPH male accessory glands, and thereby increase planthopper fecundity.[7][8] Some insecticides increase the amount of amino acids and sucrose available in the phloem of rice plants, and thereby increase BPH survival.[9]
Excessive use of urea as nitrogenous fertilizer and insecticides can lead to outbreaks by increasing the fecundity of the brown planthopper, and by reducing populations of natural enemies.[10][11][12] It follows that the primary integrated pest management (IPM) approach includes restricting the inappropriate and excessive use of these inputs. For example in 2011, the Thai government announced an initiative to respond to a major brown planthoppers outbreak by restricting outbreak-causing insecticides including abamectin and cypermethrin; the decision was supported by the International Rice Research Institute (IRRI).[13] IRRI also outlined recommendations foe an Integrated Pest Management (IPM) action plan to limit planthopper outbreaks.[14] In December 2011, the IRRI held a conference in Vietnam to address the threats of insecticide misuse and explore options for mitigation.[15]
Rice varieties with resistance to BPH, e.g. IR64, are important for preventing outbreaks.[16][17][18] However, in areas with low insecticide use, high levels of BPH resistance are not usually necessary.[19] Chemical mutagenesis can significantly increase or decrease BPH resistance levels of rice.[20] Some chemical insecticides, e.g. imidacloprid, can affect the gene expression of rice and thereby increase susceptibility to BPH.[21]
In an attempt to make BPH control more species-specific, researchers are trying to develop methods of turning off specific BPH genes for digestion-, defense- and xenobiotic metabolism. Many novel genes for these functions have been detected in tissue from BPH intestines.[22]
Some plant lectins are antifeedants to BPH and if properly formulated may have the potential to protect rice from BPH.[23][24][25][26] use resistant variety laal
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