-11-


 controlled beggarweed (Desmodium tortuosum (Sw.) DC.) and goosegrass
 (Eleusine indica (L.) Gaertn.) as well as hand wedbing..'.Acceptable cohtr6l--'
 of hairy indigo (Indigofera hirsuta Harvery) was obtained with napropamide
 + fluazifop-butyl + glyphosate. Total number of 'Florida Belle' daughter
 plants reduced by treatments containing napropamide and alachlor, while all
 of the herbicide treatments reduced the number of 'Dover' plants produced.

DISEASES:

 25. Howard, C. M., and E. E. Albregts. 1982. Outbreak of Verticillium wilt of
 strawberries in central Florida. Plant Disease. 66(9):856-857.

 Verticillium wilt of strawberries (Fragaria X ananassa) was found in central
 Florida for the first time in 1981. Surveys showed that all infected plants
 came from two nursery fields in Michigan. The greatest percentage of wilt
 occurred in plants that were grown in soil that had grown potatoes (Solanum
 tuberosum) the previous year and was fumigated with 98% methyl bromide +
 25 chloropicrin rather than 67% methyl bromide + 33% chloropicrin before
 setting the strawberries. A formulation of 50% methyl bromide + 50%
 chloropicrin at 420-470 kg/ha is recommended for control.

 26. Howard, C. M., and E. E. Albregts. 1982. Strawberry anthracnose, crown rot,
 and black leaf spot caused by Colletotribhum 'ftaiire. Dover'AREC-Research
 Report DOV-1982-2. 5 pp.

 Strawberry anthracnose, caused by the fungus Colletotrichum fragariae, Brooks,
 has been a serious problem in summer plant production nurseries in Florida
 at least since the late 1920's. The fungus is known to cause spotting and
 girdling of runners and petioles, crown rot resulting in wilting and death of
 plants, and fruit rot. Since the late 1970's, the anthracnose fungus has
 been consistently associated with a black leaf spot of strawberry in the
 summer nursery. Black leaf spot has now been shown to be caused by this
 fungus and often is the first indication that the anthracnose disease is
 present.

 27. Howard, C. M., and E. E. Albregts. 1982. Cleistothecia of Sphaerotheca
 macularia on strawberry plants in Florida. Plant Disease. 66:261-262.

 Cleistothecia of Sphaerotheca macularis were found in 1981 for the first
 time on strawberry plants in Florida. They were found only on plants that had
 been gpown in Maine and Michigan and were transplanted into Florida fruit
 production fields. Benonyl and sulfur failed to control powdery mildew on
 these plants. Powdery mildew was widespread on plants that had been grown
 in five other states, but no cleistothecia were found on these plants, and
 benonyl or sulfur controlled the disease.

 28. Howard, C. M., and E. E. Albregts. 1982. Evaluation of fungicides for
 control of strawberry fruit rots. Fungicide and Nematicide Tests. 37:50.

 Strawberry plants were set through plastic mulch on raised beds on Oct. 9,
 1980. Pesticides tested were Benlate, Topsin M, Captan, Rovral, Plictran,
 Top-Cop S, and Difolatan. None of the treatments in this trial caused
 phytotoxicity. Because of unusually cold weather the incidence of fruit rots
 was very low. Only Alternaria fruit rot was sufficiently severe to analyze
 statistically. No treatment significantly increased marketable fruit yield
 above that in the check. Marketable yield was significantly less than the
 check in plots receiving Top Cop S or Difolatan.