| Species: | Panonychus ulmi | |
| Genera: | Panonychus | |
| Family: | Tetranychidae | |
| Distribution: | South Africa, Australia,New Zealand, Canada, United States, Argentina, UK, Brazil, Chile, Costa Rica, Cuba, Uruguay, Venezuela, China, India, Taiwan,Vietnam, Afghanistan, Algeria, Austria, Azerbaijan, Belarus, Belgium, Bulgaria, Czechoslovakia, Denmark, Egypt, Finland, France, Germany, Greece, Hungary, Iran, Ireland, Israel, Italy, Japan, Kazakhstan, Korea, Lebanon, Libya, Lithuania, Portugal, Morocco, Netherlands, Norway, Poland, Portugal, Romania, Russia, Spain, Sweden, Switzerland, Syria, Tajikistan, Tunisia, Turkey, Ukraine, United Kingdom, Uzbekistan, Yugoslavia | |
| Host Crops: | More than 140 host crops are reported in literature belonging to families Amaranthaceae, Anacardiaceae, Apiaceae (Umbelliferae), Asclepiadaceae, Asteraceae, Bambusaceae, Betulaceae, Caprifoliaceae, Chenopodiaceae, Convolvulaceae, Cucurbitaceae, Ebenaceae, Fabaceae, Fagaceae, Hippocastanaceae, Iridaceae, Juglandaceae, Juncaceae, Malvaceae, Moraceae, Musaceae, Myricaceae, Myrtaceae, Oleaceae, Poaceae, Polemoniaceae, Polygonaceae, Rhamnaceae, Rosaceae, Rubiaceae, Rutaceae, Salicaceae, Sapindaceae, Saxifragaceae, Solanaceae, Theaceae, Tiliaceae, Ulmaceae, Vitaceae Important pest of fruit crops especially apple. | |
| Nature of Damage: | Mostly it occurs on the upper surface of the foliage and that too mainly on spur foliage. Heavy population leads to reduced fruit size and yield as it interfers with fruit bud formation. Adults, larvae and nymphs suck sap from leaves and discolour them, which results in poor size and colour of the fruits in the current year and reduced fruit set in subsequent years | |
| Life Cycle: | It overwinters as an egg. Eggs are laid mostly on spurs, small branches, cracks and crevices of the bark. Eggs hatch in early spring . P. ulmi completes one generation in 2-4 weeks depending on the temperature. In one year, 4-5 generations are completed by this mite. | |