Pests
Jasmine is comparatively a hardy plant. Major pests are bud and shoot borers and blossom midge, which can be controlled by spraying 0.15-0.20% carbaryl.
Bud Worm (Hendecasis duplifacialis)
It is a greenish larva with a black head, which bores into immature jasmine buds and feeds on floral structures and, in severe cases, webbing of buds.
Control: A basal application of carbofuran (40g/plant) is recommended for control.
The Gallery Worm (Elasmopolpus jasrninoghagus)
It is a serious pest, which causes webbing of terminal leaves, shoots and towers.
Control: The plants should be sprayed with Malathion (0.2%) to control these insects.
Mites
The mites attack the undersurface of leaves, which become yellow and drop off. Severe puckering and discoloration of leaves are caused by the gall mite in J. auriculatum. The variety Parimullai released by the TNAU, Coimbatore, is resistant to gall mite.
Control: Wettable sulphur (0.3%) can be sprayed on the infested plants to control this pest.
Root-Knot Nematode (Meloidogyne incognita)
It causes severe stunting of plants, branches become dry with yellow leaves which drop prematurely.
Control: Application of neem cake at 1 t/ha or carbofuran at 2.5kg/ha effectively suppresses the nematode population.
Source: http://www.ficciagroindia.com/production-guidelines/flowers/Jasmine/pests.htm
Diseases
Leaf-blight (Cercospora jasminicola and Alternaria jasmini)
This disease occurs in a severe form on J. grandiflorum. Reddish-brown, circular spots are produced on the upper surface of the leaves, spreading rapidly in the rainy season. The infected leaves curl and start drying from the margins. Even the young shoots dry up. In severe cases of infection, vegetative buds and young branches dry up. The flower production is very much reduced in infected plants.
Control: Can be controlled by spraying 0.2% mancozeb or 0.1% benomyl.
Rust (Urormyces hobsoni)
Rust occurs on all the aerial parts of the plants including flowers. Yellowish orange coloured pustules appear on the lower side of the leaves and also on young twigs and flowers buds. The infected parts become distorted.
Control: Controlled by spraying 0.2% zineb.
Wilt (Fusarium solani)
The disease occurs in patches and the roots turn black. In the case of sclerotial wilt, in addition to the above symptoms, white mycelia are found generally girdling the roots and the sclerotia are found adhering to the roots of the wilted plants.
Control: Drench the soil with 1% Bordeaux mixture.
Source: http://www.ficciagroindia.com/production-guidelines/flowers/Jasmine/diseases.htm