10. MYCELIA STERILIA

Himantia stellifera Johnston

van der Byl (1919) 204, (1921 b) 122 ; McMartin (1937 b) 267, 353, (1938) 214 ; Stevenson & Rands (1938) 275.

on Imperata cylindrica Beauv., Natal and Zululand, v. d. Byl.

Saccharum officinarum Linn., Natal and Zululand, v. d. Byl ; Natal, McMartin.

Rhizoctonia crocorum (Pers.) DC.

Doidge & Bottomley (1931) 35 ; Hopkins (1938 a) 125, (1939 a) 34.

Helicobasidium purpureum Pat. (Rhizoctonia stage) Hopkins (1938 a) 110, (1939 a) 21, 26.

on Glycine max Merr., roots, Salisbury (Rh. 1277).

Medicago sativa Linn., roots, Avondale (Rh. 2313) ; Shangani (Rh. 860) ; N'karini, Weenen, Glasse, 2540, v. d. Byl (v. d. Byl 584) 31833 ; Transvaal.

Pinus longifolia Roxb., Salisbury (Rh. 1109) Hopkins.

Rhizoctonia lamellifera Small

Hopkins (1933 b) 65, (1938 a) 125, (1939 a) 13, 26, 34, (1943) 182 ; Laughton (1936) 381.

isolated from

Acacia mollisima Willd., Albert Falls ; widespread in Natal and eastern Transvaal, Ledeboer.

Citrus maxima Merr., Umtali, Hopkins ; Moçambique (Rh. 878, 992).

Citrus sinensis Osbeck, Mazoe, Hopkins (Rh. 571, 572, 577, 584, 585, 590, 591, 594, 610, 869, 1060, 1506).

Mangifera indica Linn., Salisbury, Hopkins (Rh. 883).

Medicago sativa Linn., Salisbury, Hopkins (Rh. 2992).

Pinus echinata Mill., Tokai, Laughton.

Pinus muricata Don., Tokai, Laughton.

Pinus pinaster Ait., Hout Bay, Laughton.

Pinus radiata Don., Tokai, Laughton ; Salisbury (Rh. 2388).

Pittosporum undulatum Vent., Salisbury (Rh. 936, 1261).

Rhizoctonia solani Kühn

Verwoerd (1931 a) 301 ; Hopkins (1939 a) 125, (1939 a) pp., (1943) 183. Rhizoctonia sp., Doidge & Bottomley (1931) 16.

on Antirrhinum majus Linn., Salisbury (Rh. 2310, 2481, 3394).

Cynodon dactylon Pers., general in the Transvaal, common on bowling greens, Bottomley ; Premier Mine, 15673 ; Salisbury, Bulawayo, Selukwe, Hopkins.

Dianthus caryophyllus Linn., destructive, especially in the northern Transvaal, Bottomley ; Duivelskloof ; Benoni, Naude, 33899 ; Johannesburg, Hughes, 20685 ; Brits, 28542.

738

Gossypium sp., Salisbury (Rh. 960, 977 ; Swaziland, Lockie, 30099.

Lactuca sativa Linn., Salisbury (Rh. 1381).

Lycopersicum esculentum Mill., Rhodesia, general, Hopkins.

Nicotiana tabacum Linn., Rhodesia general, Hopkins.

Solanum tuberosum Linn., very common on tubers throughout the Union ; Bloemfontein, Verwoerd ; Rhodesia, Hopkins; Port Elizabeth, Voisin, 26334; Sterkfontein, Bloemfontein Distr., Lyon, 19845 ; Stellenbosch, Verwoerd (Stell. 332) ; on stems and roots, Umhlanga Rocks, Wager.

Rhizoctonia spp.

Doidge & Bottomley (1931) pp. ; Laughton (1936) 381 ; McMartin (1937) 267, 353, (1938) 215.

sub Rhizoclonia solani Kühn, Hopkins (1938 a) 125, (1939 a) pp.

on Beta vulgaris Linn. (sugar beet), Pretoria, 20310, 20312.

Cynodon dactylon Pers., causing " dollar spot '' on bowling and putting greens, Transvaal, Bottomley ; Pretoria, Home, 27343.

Matthiola incana R. Br., Southern Rhodesia, Hopkins.

Pinus longifolia Roxb., Salisbury (Rh. 460).

Pinus pinaster Ait., Ermelo, Laughton.

Pinus radiata Don., Stapleford, Hopkins (Rh. 1013).

Saccharum officinarum Linn., Natal, McMartin.

on seedlings of indigenous trees, Knysna, Laughton ; and on underground parts of many other plants ; see host index.

Sclerotium cepivorum Berk.

du Plessis (1933 b) 7.

on Allium cepa Linn., bulb, Stellenbosch, du Plessis ; Caledon, Villiersdorp, Paarl, Dippenaar ; Jackson's Drift, Muller ; Wolseley, du Plessis (Stell. 593) ; Southern Rhodesia, Hopkins.

Sclerotium delphinii Welch

sub Sclerotium rolfsii Sacc., Hopkins (1939 a) 17.

? on Delphinium cultorum Voss, Pretoria, Doidge ; Marylands (Rh. 37) ; Salisbury (Rh. 2641, 2794).

Sclerotium rolfsii Sacc.

Moore (1926) 455: Doidge & Bottomley (1931) pp. ; McMartin (1938) 215; Hopkins (1938 a) 125, (1939 a) pp., (1943) 184 ; Bottomley (1932) 20.

as Sclerotium sp., Eyles (1926) 633 ; Verwoerd (1929 b) 6.

on Arachis hypogaea Linn., Settlers, Haywood, 30500 ; Rutland Siding, Sellschop, 30647 ; Naboomspruit, 30699 ; Wesselsnek, 33895 ; Nuffield, Sellschop ; Salisbury, Eyles (Rh. 1234, 1313, 2359) ; Arcturus (Rh. 423) ; common and destructive.

Dianthus caryophyllus Linn., Transvaal and Natal, destructive ; Sanddrift, Brits, Terblanche, 31046 ; Salisbury, Hopkins.

Pyrus malus Linn., Town Bush Valley and Edendale, Doidge ; Godwan River ; Laingsburg, Verwoerd, M'Soneddi, Hopkins.

also found on underground plants of numerous plants, for which see host list.