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Articles by Ghulam Hussain Mallah
Total Records ( 2 ) for Ghulam Hussain Mallah
  Ghulam Hussain Mallah , Akram Khan Korejo , Abdul Razaque Soomro and Abdul Wahid Soomro
  Biological control is the most important component of IPM because a number of pests of a crop, remain under natural control if crop is unsprayed. Many natural enemies such as predatory beetles, bugs, lacewings and spiders have been recorded in cotton fields in Sindh Pakistan, but their potential value has been widely exploited in cotton pest management due to lack of techniques to conserve and maximize both their abundance and effectiveness. During 1999 cotton season population dynamics studies were carried out to observe the beneficial insects under sprayed and unsprayed conditions at Sakrand Sindh. Three spray applications were given in sprayed block with Dimethoate 40 EC, Thiodan 35 EC and Tracer 480 SC against sucking and bollworm complex of cotton. Predators appeared 10 days after germination of cotton plant. The species observed during the season were i.e. chrysopa, orius, geocoris, spiders, coccinellids, Zanchius and campylomma. The numbers of predators ranging from three to fifty six thousand in unsprayed plot and 0.7 to 8.9 thousands in sprayed block. These predators were active throughout the cotton season with a peak population during July and August.
  Ghulam Hussain Mallah , Ghulam Akbar Panhwar and Mohammad Yousif Solangi
  Cultivated vegetables, selected ornamental plants and weed hosts have been sampled throughout the year during 1997 to gain a better understanding of the pest and their relative importance in this regard. Key factors identified as contributing to the problem in cotton are; intensive use of pesticides, mild winters (Permitting greater survival), the year round sequence of suitable hosts (both cultivated and weeds), thus providing the bridge which permits populations to cycle from cotton season to cotton season by continuing to reproduce, albeit more slowly on less suitable hosts and in winters. Overall whitefly numbers were much higher on brinjal. The important ornamental hosts were Lantana and hibiscus which ameliorate cold winter conditions and therefore enhance over winter survival of whitefly Whitefly populations decrease drastically but do not disappear completely from the major vegetables when winter temperature drop. It is important to mention that the bringal had ten times more whiteflies than did the other vegetables and weed hosts. Sonchus was found excellent weed host of whitefly. Our research to date , indicates that the most vulnerable time of the year for the whitefly is late winter when populations are at their lowest level. At this time a combination of several practices on an area wide basis might result in breaking the cycle.
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