Walnut Pests

Pests of National Significance

Insect pests

• Stem borer: Aeolesthes sarta Solsky (Coleoptera: Cerambycidae)
• Bark beetle/Shot-hole borer: Scolytus nitidus Schedl (Coleoptera: Scolytidae)
• Gypsy moth: Lymantria obfuscata Walker (Lepidoptera: Lymantriidae)
• Leaf roller: Archips argyrospilus (Walker) (Lepidoptera: Tortricidae)
• Mealybug: Drosicha dalbergiae (Stebbing) (Hemiptera: Margarodidae)
• Grey weevil: Myllocerus sp. (Coleoptera: Curculionidae)
• Walnut weevil: Alcides porrectirostris Marshall (Coleoptera: Curculionidae)

Diseases

• Leaf spot: Alternaria sp
• Leaf blotch: Marsonina juglanse (Lib.) Magnus and Gnomonia leptostyla (Fr.) Ces. & De Not.
• Dieback: Glomerella cingulata (Stoneman) Spauld. & H. Schrenk
• Powdery mildew: Phyllactinia spp.
• Walnut blight: Xanthomonas campestris (Pammel 1895) Dowson
• Anthracnose: Gnomonia leptostyla (Fr.) Ces. & De Not.,
• Phytophthora root and crown rot: Phytophthora spp
• Armillaria root rot (Oak root fungus): Armillaria mellea (Vahl) P.Kumm.
• Crown gall: Agrobacterium tumefaciens Smith & Townsend,
• Walnut canker: Geosmithia morbida M.Kolařík, E.Freeland, C.Utley & Tisserat

Weeds

Broadleaf

• Tropical spiderwort: Commelina benghalensis L. (Commelinaceae)
• Creeping wood sorrel: Oxalis corniculata L. (Oxalidaceae)
• Goat weed: Ageratum conyzoides L. (Asteraceae)
• Sowthistles: Sonchus spp. (Asteraceae)
• Congress grass: Parthenium hysterophorus L. (Asteraceae)
• Lambs quarter: Chenopodium album L. (Chenopodiaceae)
• Sweet yellow clover: Melilotus indica (L.) All. (Fabaceae)
• Toothed Dock: Rumex dentatus L. (Polygonaceae) Grasses
• Bermuda grass: Cynodon dactylon (Poaceae)
• Cogon grass: Imperata cylindrica (L.) Raeusch. (Poaceae)
• Blanket grass: Axonopus compressus (Sw.) Beauv. (Poaceae)
• Large crabgrass: Digitaria sanguinalis L. (Scop.) (Poaceae)
• Knot grass: Paspalum distichum L. (Poaceae) Sedges
• Purple nutsedge: Cyperus rotundus L. (Cypraceae)

Pests of Regional Significance

Insect pests

• Aphids: Chromaphis juglandicola (Kaltenbach) & Panaphis juglandis (Goeze) (Hemiptera: Aphididae)
• Coding moth: Cydia pomonella Linnaeus (Lepidoptera: Lasiocampidae)
• San Jose scale: Quadraspidiotus perniciosus (Comstock) (Hemiptera: Diaspididae)

IPM for Walnut

To know the IPM practices for Walnut, click here.

Source: NIPHM; Directorate of Plant Protection, Quarantine & Storage