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An experiment was conducted to study the effect of priming treatments on artificially aged seed germination and seedling growth of guava (Psidium guajava L.) at Department of Seed Science and Technology, CCS Haryana Agriculture University, Hisar during 2019–20. It is comprised 21 treatments in complete randomize design with three replications. There were five priming methods with different treatments under study i.e. tap water, GA3 (at 500, 700 and 1000 ppm concentration), KNO3 (at 0.5 and 1% concentration), thiourea (at 0.5 and 1% concentration) and HCl (at 5% and 10% for 2 and 4 min). Duration of tap water, GA3, KNO3 and thiourea soaking was kept 24 and 48 hours. The study revealed that priming the artificially aged seeds in KNO3 greatly increased germination, especially soaking of artificially aged seeds in KNO3 at 1% for 48 h which shows up to 45.0% germination. Parameter like germination%, mean germination time, seedling length, seedling dry weight and seedling vigour were positively affected by all the priming treatments. Artificially aged seed viability decreased but the standard germination efficiently increased due to priming treatments. KNO3 at 1% for 48 h improved germination and resulted in maximum dry weight of seedling (206.0 mg), seedling length (4.16 cm) and vigour index I and II (187.0 and 9271.0) in laboratory. Artificially aged seeds without any priming treatments showed poor growth and germination.

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main reasons for low productivity is the low availability of essential nutrients, as the farmers are supplying only N, P and K fertilizers and that too indiscriminately and secondly the interspaces which are left as such, are timely covered with perennial weeds which compete with essential nutrients and moisture, thereby reducing their availability. These perennial weeds actually go deeper into the soil for moisture, and lot of water is also transpired from them. Due to this crop-weed competition, fruit trees mostly suffer from water stress and also have an impact on yield and quality of fruits, (Derr 2001). So if the interspaces of orchards are utilized by growing different intercrops, that are compatible with

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Haryana is the leading state in seasonal mushroom production contributing approximately 4000 tonnes per year. Reports are available on the occurrence of mites including Tyrophagus putrescentiae in oyster mushrooms. Mites have been found to damage mushrooms right from spawning to the harvest of the crop. Mite damage on the fruiting bodies often shows up as the small cavities in the stem and cap similar in appearance to bacterial pit disease. Myceliumeating mites can cause high yield losses. Although pesticides (permetrin, perefosmetil, anometrin, forbecide and dichlorvos) are applied, but due to growing ecological and health concerns, bio-control methods are being developed against pests. There is a need to exploit the use of plant products which have acaricidal properties and are safe for mushroom mycelium. Plantderived alkalis, alcohols, aldehydes, terpenoids and some monoterpenoids show fumigant properties and thus, the use of plant based pesticides is preferred against pests and diseases in mushroom production.

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