Field Management of Late Blight of Tomatoes Caused by Phytophthora infestans Using Antibiotics from Streptomyces species

Several plant extracts were screened for
antibacterial activity against Pseudomonas syringae pv.
phaseolicola and Xanthomonas campestris pv. phaseoli in
vitro. Extracts from Eucalyptus citriodora Hook,
Nothoscordum inodorum L., Cupressus lucistanica Mill,
Tagetes minuta L. and Santolina chamaecyparissus L. were
found to be active on the two phytobacterial pathogens.
The volatile oil of E.citriodora produced a significantly (P
= 0.05) wider zones of growth inhibition on P. syringae pv.

Race Typing and Evaluation of Aggressiveness of Exserohilum turcicum Isolates of Kenyan, German and Austrian Origin

Exserohilum turcicum the causal agent of northern corn leaf blight is a threat to corn production in
many areas of the world. The pathogen has a high genetic variability in terms of virulence, genetic structure
and several races have been reported. Diseased corn plants from Kenya, Germany and Austria were used to
isolate the pathogen following the standard isolation procedures. Detached leaf technique using leaves of
maize plants with (Ht0) genes for resistance were used to evaluate aggressiveness and the parameters assessed

Survey of bacterial blight of coffee in Kenya and studies of kinetics of pseudomonas syringae, van hall in coffee foliage.

A survey was conducted in the coffee growing
areas of Kenya during the months of August, September,
and October 1987 to determine the ecological distribution
of bacterial blight of coffee and its incitant
Pseudomonas syringae, Van Hall.
The survey covered the three main coffee growing
zones viz. upper middle zone 1 (UM1), upper middle
zone 2 (UM2), which forms the main coffee growing
zone and upper middle zone 3 (UM3) which is the marginal
coffee zone.
Three types of.Pseudomonads appeared consistently

Phytophthora infestans responses to stinging nettle extract, phosphoric acid and fungicides combination, in Kenya

Late blight is a significant disease of solanaceous
crops
worldwide. Knowledge on sensitivity of late blight
pathogen (
Phytopthora infestans
) to metalaxyl and different
fungicides is important for effective management of
late
blight.
In vitro
studies were carried out to evaluate the
sensitivity of
P. infestans
to different levels of Metalaxyl
Ridomil, Dithane M45, phosphate and stinging nettle
.
Sensitivity to metalaxyl and other different fungic
ides was

The supply responsiveness of wheat farmers in Kenya

This study shows how wheat farmers respond to price incentives in Trans-Nzoia, Uasin-Gishu, Nakuru, Narok and Nyandarua districts of Kenya. The prices are the annual and one-year lagged prices of wheat and other competing enterprises in each district The Nerlovian partial adjustment model is used to analyse the data by district. The calculated price elasticities indicate that farmers in these districts, except Narok, have high positive response to annually announced wheat prices. Some policy implications are drawn from the analysis.

Resource use efficiency among small scale wheat farmers in Uasin Gishu district, Kenya

This study evaluates the efficiency of the resources used
by the small-scale wheat producers in Uasin Gishu District. The
aim of the study is to suggest ways of increasing the
productivity of these farms and hence the rural incomes as the
sale of wheat is a source of revenue to the farmers. Increased
productivi ty of the small-scale wheat producers is a step
towards national self-sufficiency in wheat flour which is a
basic foodstuff. The objective therefore, was to determine the

"Efficacy of fungicide mixtures for the management of Phytophthora infestans (US-1) on potato"

Fungicide application strategies (timing, frequency, rates and mixtures) are important for the control and
resistance management of potato late blight caused by Phytophthora infestans. The efficacy of fungicide
mixtures consisting of fenamidone + mancozeb and propamocarb HCL + mancozeb at various rates and
in spray regimes containing metalaxyl and mancozeb was evaluated for late blight control (US-1) at four
locations in Kenya. Propamocarb HCL + mancozeb significantly (P< 0.05) reduced foliar blight compared

Studies on the effects of stinging nettle extract, phosphoric acid and conventional fungicide combinations on the management of potato late blight and tuber yield in the Highlands of Kenya

Efficacy of stinging nettle extract, phosphoric aci
d and
fungicides combinations was assessed for late bligh
t control
for two cropping seasons at Tigoni and Marimba loca
tions
in Kenya. Disease severity, relative area under dis
ease
progress curves (RAUDPC), pathogen lesions sizes an
d
numbers, and tuber yield were quantified during the
2008
and 2009 cropping cycles. The application of metala
xyl
alternated with phosphoric acid resulted in signifi
cant

Effect Of Cropping Systems On The Occurrence Of Fungal And Bacterial Diseases Of Legumes In Western Kenya

Bacterial and fungal diseases of legumes are a major constraint in legume production in western
Kenya and persistently curtail optimal yields and quality of food legumes. This study aimed at
determining the occurrence of fungal and bacterial diseases of these legumes and the
contribution of seed quality to their occurrence, in diverse agro-ecological zones of western
Kenya. The study was carried out during the short rains season (months of October, November
and December) of 2013 in seven Counties with diverse agro-ecological zones. A total of 635

Pages