Some prominent threats to orchids at Sindhudurg:

Habitat destruction is major threat to   wild orchids, over years  during my field visits I have observed natural population of orchids reducing drastically due to following reason

Collection of fuel: Wood Catunaregam spinosa which forms good host for many orchids such as Dendrobium barbatulum, Dendrobium microbulbon, Oberonia recurva, Smithsonia viridiflora & so many, this is bushy short plant which becomes dry in summer, easy to cut hence commonly collected for fuel. With reduced number of these plants population of these orchids is also reduced. Due to collection of fuel wood, orchids growing under dense shade like Cheirostylis parviflora, Liparis deflexa, Crepidium versicolor & Zeuxine longilabris is also drastically reduced
Road widening: Epiphytes like Aerides crispa, A. maculosa, Acampe praemorsa, Dendrobium ovatum, D. aqueum, D. lawianum, Bulbophyllum fimbriatum and so many are destroyed as host plants get cut for road widening. Some ground orchids like Pecteilis gigantea, Nervilia aragoana,  Habenaria gibsonii growing on road side under shades of trees are also destroyed in the process. When road side trees are cut, plants growing on trees towards interior side of forest are also exposed to heat and pollution therefore orchids like Smithsonia viridiflora and Porpax exilis are disturbed and destroyed because they prefer shady cooler places on tree. 
Animal Threat: Some rodents and wild pigs feed on root tubers of orchids like Pecteilis gigantea so plants are uprooted and destroyed. Grazing animals feed on ground orchids like Habenaria along with grasses and other plants. Feet of grazing animals are also destroying ground orchids. Some insects feed on floral parts of orchids also forms threat for them.
Mining: Mining for Bauxite and iron ore are major threat to epiphytic as well as terrestrial orchids. Mining at Shiroda and Kalane area has destroyed whole flora and fauna in that region including all orchids Rock mining in laterite plateau is responsible for destruction of Lithophytes such as Habenaria grandifloriformis and Habenaria marginata. Not only mining area but nearby vegetation is also affected due to emission gases and dust particles emitted by mining activities & vehicle used for transport
Tourism tourists & hobbyists: In year 1999 Sindhudurg district has come on tourism map of the world since then destruction of flora and fauna has started rapidly. Construction of new roads in forest area widening of older roads is main cause of habitat destruction for orchids 
Number of hotels and resorts are constructed in forest area destroying orchid habitat. To attract tourist, owners of resorts & hotels collect and try to grow wild orchids with attractive fragrant flowers such as Aerides crispa & Pecteilis gigantea, as ornamental plants around their places without any care and knowledge about growing orchids, most of the times these orchids cannot thrive in new habitat & natural population of orchids is also getting reduced
Most of the tourists are hobbyists, they are uprooting orchids mercilessly for growing in their balconies in metro cities, without any knowledge of growing orchids, such orchids perish as they cannot get adapted to polluted metro cities, this trend further reduce natural population of orchids 
Garbage, plastic waste bottles thrown in forest area by tourists make ground orchids to get suffocated. While gaseous exhaust from vehicles affects natural population of epiphytic orchids Epiphytic orchids such as Aerides crispa, Dendrobium barbatulun, Porpax exilis, Porpax filiformae and different species of Oberonia which were found growing on road side trees at Amboli, are completely vanished now.
Deforestation for cultivation: In Sindhudurg district climate is perfect for growing banana, cashew & rubber therefore wherever there is natural water bodies & on hill slopes, deforestation is done, land is cleared for cultivation of commercial crops such as rubber, cashew, pineapple & banana which is major threat to epiphytic as well as ground orchids 
Invasion of exotic weed species: Chromolaena odorata is weed dominating habitat of Zeuxine longilabris, natural population of this orchid seen drastically reduced due to this weed. Natural population of Habenaria marginata and Pecteilis gigantea is also affected by C. odorata. Lantana camara is another such exotic weed destroying vegetation 
Forest fire: Though natural fires are uncommon in Sidhudurg forest Man made fire destroy natural population of both terrestrial as well as epiphytic orchids.